Campbell Biology Chapter 14 Mendel and The Gene Idea PDF

Campbell Biology, 12e (Urry) Chapter 14 Mendel and the Gene Idea 14.1 Multiple Choice Questions 1) Which of the following statements correctly describes the terms monohybrid cross and dihybrid cross? A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B)...

Campbell Biology, 12e (Urry) Chapter 14 Mendel and the Gene Idea 14.1 Multiple Choice Questions 1) Which of the following statements correctly describes the terms monohybrid cross and dihybrid cross? A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B) A dihybrid cross involves organisms that are heterozygous for two characters that are being studied, and a monohybrid cross involves organisms that are heterozygous for only one character being studied. C) A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two generations. D) A monohybrid cross results in a 9:3:3:1 ratio, whereas a dihybrid cross gives a 3:1 ratio. Answer: B Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1; Global LO: G1, V&C LO: VC-SF. 2) Which of the following sentences state a significant conclusion that Gregor Mendel drew from his experiments with pea plants? A) There is considerable genetic variation in garden peas. B) Traits are inherited in discrete units and are not the result of "blending." C) Recessive genes occur more frequently in the F1 generation than do dominant ones. D) Genes are composed of DNA. Answer: B Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G7 , V&C LO: VC-E 3) How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE? A) 4 B) 8 C) 16 D) 64 Answer: B Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G2, V&C LO: VC-E 1 Copyright © 2021 Pearson Education, Inc. 4) Which of the following best describes how an individual with genotype AaBbCCDdEE can make haploid gametes with different genotypes? A) mutations during meiosis form new alleles that are incorporated into the gametes B) crossing over during prophase I leads to increased genetic diversity C) the inheritance of a particular copy of one chromosome does not affect the inheritance of a different chromosome D) dominant alleles tend to be inherited together Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G2, V&C LO: VC-I 5) Which of the following best describes how an individual with genotype AaBbCCDdEE can make gametes with eight different genotypes. A) mutations during meiosis form new alleles that are incorporated into the gametes B) crossing over during prophase I leads to increased genetic diversity C) the inheritance of a particular copy of one chromosome does not affect the inheritance of a different chromosome D) dominant alleles tend to be inherited together Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G2 , V&C LO: VC-I 6) Which of the following describes why Mendel continued some of his experiments into the F2 or F3 generation? A) Collecting data from more generations allowed him to obtain a larger number of offspring. B) Following multiple generations allowed him to determine whether a recessive trait would reappear. C) Determining whether a dominant trait would reappear required multiple dihybrid crosses. D) Data from the F1 generation did not allow him to distinguish which alleles were segregating Answer: B Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-E 7) Which of the following statements about the law of independent assortment is correct? A) It describes the inheritance of different genes relative to one another. B) It describes the inheritance of different alleles relative to one another. C) It is the consequence of having two copies of each chromosome in somatic cells and one copy in gametes. D) It is the reason that dominant alleles are visible in the organism's phenotype. Answer: A Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G1, V&C LO: VC-E 2 Copyright © 2021 Pearson Education, Inc. 8) Which of the following statements about the law of segregation is correct? A) It describes the inheritance of different alleles relative to one another. B) It describes the inheritance of different chromosomes relative to one another. C) It explains how codominant alleles each affect the phenotype in separate ways. D) It describes situations where either genotype or environment affect phenotype, but not both. Answer: B Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G1, V&C LO: VC-E 9) A diploid animal is dihybrid at the Head shape (H) and Tail length (T) loci. Which of the following gamete genotypes can it produce? A) Hh B) HhTt C) HHTT D) Ht Answer: D Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G1, V&C LO: VC-E 10) Which of the following statements correctly describes how Mendel explained why traits disappeared in the F1 generation and then reappeared in the F2 generation? A) New mutations were frequently generated in the cross that generated F 2 offspring, causing traits that had been lost in the F1 to reappear in the F2. B) The mechanisms controlling the appearance of traits in the F1 and F2 plants were different. C) Traits can be dominant or recessive, and the recessive traits were "hidden" by the dominant ones in the F1. D) Members of the F1 generation had only one allele for each trait, but members of the F2 had two alleles for each trait. Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G1, V&C LO: VC-E 3 Copyright © 2021 Pearson Education, Inc. 11) When Mendel set up a Parental (P) cross between true breeding purple and white flowered plants to generate the F1 and then allowed the F1 to self-pollinate to generate the F2 he saw a dominant to recessive ratio of 3:1. What phenotypic ratio would be expected if he crossed the F 1 with the original purple parent? A) 4:0 B) 1:1 C) 3:1 D) 9:3:3:1 Answer: A Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G1, V&C LO: VC-PS 12) Which of the following statements correctly explains the fact that all seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment? A) None of the traits obeyed the law of segregation. B) The diploid number of chromosomes in the pea plants was seven. C) All of the genes controlling the traits had only two different alleles. D) All of the genes controlling the traits were on different chromosomes. Answer: D Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 5-6: Evaluating/Creating Learning Outcome: 14.1 Global LO: G1, V&C LO: VC-S 4 Copyright © 2021 Pearson Education, Inc. 13) Use the figure and the following description to answer the question. In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F1 cross is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with dark leaves? A) 1 only B) 4 only C) 1, 2, and 3 D) 2, 3 and 4 Answer: D Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G3, V&C LO: VC-QR 5 Copyright © 2021 Pearson Education, Inc. 14) Use the figure and the following description to answer the question. In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F1 cross is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with a heterozygous genotype? A) 1 and 4 only B) 2 and 3 only C) 1, 2 and 3 D) 2, 3, and 4 Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G3, V&C LO: VC-QR 6 Copyright © 2021 Pearson Education, Inc. 15) Use the figure and the following description to answer the question. In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F1 cross is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants that will be true-breeding? A) 1 and 4 only B) 2 and 3 only C) 1, 2, 3, and 4 D) 1 only Answer: A Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G3, V&C LO: VC-QR 16) In a certain species of diploid fish a single gene controls skin color. Researchers have found four different alleles of this gene within the fish population. How many different gamete genotypes are possible in an individual of this species? A) 2 B) 4 C) 8 D) 16 Answer: A Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-I 7 Copyright © 2021 Pearson Education, Inc. 17) Why did all of the F1 offspring of Mendel's purple and white flowered pea cross always look like one of the two parental varieties? A) No genes interacted to produce a new unique phenotype. B) Each allele affected phenotypic expression. C) The traits blended together during fertilization. D) One allele was dominant. Answer: D Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-I 18) Mendel crossed true breeding yellow-seeded and green-seeded pea plants and then allowed the offspring to self-pollinate to produce an F2 generation. The results were as follows: 6,022 yellow and 2,001 green (8,023 total). Which of the following statements correctly describes the relationship of the allele for green seeds to the allele for yellow seeds? A) The green allele is dominant to the yellow allele. B) The two alleles exhibit incomplete dominance. C) The green allele is recessive to the yellow allele. D) The two alleles are codominant. Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-I 19) Albinism is a recessive trait where an individual does not produce the pigment melanin. A man and woman both produce melanin, but both have one parent with albinism. What is the probability that their first child will have albinism? A) 0 B) 1/2 C) 1/4 D) 1 Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G4, V&C LO: VC-PS 8 Copyright © 2021 Pearson Education, Inc. 20) Albinism is a recessive trait where an individual does not produce the pigment melanin. A man and woman who both produce melanin have one child out of three who has albinism. What are the genotypes of the man and woman? A) One parent must be homozygous for the recessive allele; the other parent can be homozygous dominant, homozygous recessive, or heterozygous. B) One parent must be heterozygous; the other parent can be homozygous dominant, homozygous recessive, or heterozygous. C) Both parents must be heterozygous. D) One parent must be homozygous dominant; the other parent must be heterozygous. Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G4 , V&C LO: VC-PS 21) A brown dog crossed with a yellow dog produced 12 brown offspring. A second brown individual was obtained. When the yellow dog was crossed with this animal, six brown and six yellow offspring were born. Which of the following best explains the results of the second cross? A) yellow is a recessive trait; brown is a dominant trait B) yellow is a dominant trait; brown is incompletely dominant C) yellow and brown are codominant D) yellow is a recessive trait; brown is codominant Answer: A Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-PS 22) In a particular plant, green seed color is dominant to blue. If two plants with green seeds were crossed and resulted in 302 green and 98 blue seed plants, what was the most probable genotype of each parent? A) G × G B) Gg × Gg C) GG × Gg D) gg × Gg Answer: B Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-PS 9 Copyright © 2021 Pearson Education, Inc. 23) When Mendel crossed yellow-seeded and green-seeded pea plants, all the offspring were yellow-seeded. Which of the following genotypic ratios was expected when Mendel crossed the F1 yellow-seeded plants with green-seeded plants? A) 1:2:1 B) 3:1 C) 1:1 D) 9:3:3:1 Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-PS 24) Pea plants produce either purple or white flowers with purple showing complete dominance. A gardener was given plants with purple flowers. Which of the following types of crosses would best allow her to determine the genotype of her plant in one generation? A) A monohybrid cross B) A dihybrid cross C) A testcross D) Self-pollination Answer: C Topic: Mendel used the scientific approach to identify two laws of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.1 Global LO: G9, V&C LO: VC-PS 25) Black fur in mice (b) is dominant to brown fur (b). Short tails (S) are dominant to long tails (s). What fraction of the progeny of crosses BbSs × BBss will be expected to have black fur and long tails? A) 1/16 B) 3/8 C) 1/2 D) 9/16 Answer: C Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G9, V&C LO: VC-PS 26) In pea plants, the tall phenotype is dominant to the dwarf phenotype. If a heterozygous pea plant is crossed with a homozygous tall pea plant, what is the probability that the offspring will be dwarf in size? A) 1 B) 0.5 C) 0.25 D) 0 Answer: D Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G9, V&C LO: VC-PS 10 Copyright © 2021 Pearson Education, Inc. 27) In a cross of individuals who both possess this genotype, AaBbCc, what proportion of the offspring is predicted to have the genotype, AABBCC? A) 1/4 B) 1/8 C) 1/16 D) 1/64 Answer: D Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G2, V&C LO: VC-E 28) A newly discovered diploid mammal has three characteristics that show simple Mendelian inheritance. Each characteristic is controlled by a single gene (A, B, or C). If a male with genotype AABBCc is crossed with a female with genotype AabbCc, what proportion of the offspring are expected to have the same phenotype as the male parent? A) 0 B) 1/4 C) 3/4 D) 1 Answer: C Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G2, V&C LO: VC-E 29) Which of the following statements best describes the addition rule of probability? A) It is the probability that two or more independent events will occur simultaneously. B) It is the probability that either one of two independent events will occur. C) It is the probability of producing two or more heterozygous offspring. D) It is the probability that a trait requires two or more generations to be seen. Answer: B Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.2 Global LO: G1, V&C LO: VC-I 11 Copyright © 2021 Pearson Education, Inc. 30) Which of the following calculations requires the use of the addition rule of probability? A) Calculating the probability of green plants from the cross AaGg × AaGg, where G is the symbol for black and A is the symbol for tall. B) Calculating the probability that parents who are heterozygous for both cystic fibrosis and polydactyly genes will have a child with both cystic fibrosis and polydactyly. C) Calculating the probability that a cross between an Hh and an hh plant will result in four offspring that are each homozygous recessive. D) Calculating the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both. Answer: D Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G1, V&C LO: VC-I 31) Two true-breeding stocks of pea plants are crossed. One parent has red, axial flowers, and the other has white, terminal flowers; all F1 individuals have red, axial flowers. Among the F2 offspring, what is the probability of producing plants with white axial flowers? A) 9/16 B) 1/16 C) 3/16 D) 1/4 Answer: C Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G3, V&C LO: VC-PS 32) Having polydactyly (extra digits on hands and feet) is a dominant trait. A man has polydactyly. His wife and oldest daughter do not have polydactyly. The couple's second child has polydactyly. What is the probability that their next (third) child will have extra digits? A) 1/2 B) 1/16 C) 1/8 D) 3/4 Answer: A Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G9, V&C LO: VC-I 12 Copyright © 2021 Pearson Education, Inc. 33) Phenylketonuria is an inherited disease caused by a recessive allele. If a woman and her husband are both carriers, what is the probability that their first child will be a girl without phenylketonuria? A) 1/4 B) 3/16 C) 3/8 D) 3/4 Answer: C Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G9, V&C LO: VC-I 34) Assuming independent assortment at all loci, what is the probability that a cross between the following parents, AABbCc × AaBbCc, will produce an AaBbCc offspring? A) 1/2 B) 1/16 C) 1/8 D) 3/4 Answer: C Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G2, V&C LO: VC-I 35) What fraction of the offspring from a cross between two animals with the genotype AaBbCc are expected to be homozygous recessive for the three traits? A) 1/4 B) 1/8 C) 1/16 D) 1/64 Answer: D Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G1, V&C LO: VC-E 36) If the parent or offspring genotypes or phenotypes are known, the pattern of inheritance can be predicted. Two organisms, with genotypes BbDD and BBDd, are mated. Assuming independent assortment of the two loci, which of the following genotypic ratios in offspring would occur? A) 1 BBDD: 1 bbdd B) 1BBDD: 1 BbDD: 1 BBDd: 1 BbDd C) 9 BBDD: 3 BbDD: 3 BBDd: 1 bbdd D) 1 BBDD: 2 BbDd: 1bbdd Answer: B Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G1, V&C LO: VC-E 13 Copyright © 2021 Pearson Education, Inc. 37) In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (CRCW) offspring of red (CRCR) and white (CWCW) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white? A) red × white B) roan × roan C) white × roan D) red × roan Answer: B Topic: Probability laws govern Mendelian inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.2 Global LO: G1, V&C LO: VC-E 38) Which of the following inheritance patterns describes the ability of a single allele to have multiple phenotypic effects? A) incomplete dominance B) multiple alleles C) pleiotropy D) epistasis Answer: C Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 39) Which of the following phenotypes is an example of polygenic inheritance? A) pink flowers in snapdragons B) the ABO blood group in humans C) white and purple flower color in peas D) skin pigmentation in humans Answer: D Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 40) Ten plants of the same genotype are planted in a large flower garden. Later that year, some of the ten plants have blue flowers and others have pink flowers. This can be best explained by which of the following statements? A) multiple alleles are involved in color determining flower color B) the allele for blue hydrangea is completely dominant over the allele for pink hydrangea C) the alleles are codominant D) environmental factors such as soil pH affect the phenotype Answer: D Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 14 Copyright © 2021 Pearson Education, Inc. 41) Which of the following scenarios describes an example of epistasis? A) Albino corn snake result from animals having recessive genotypes for each of two genes. B) In many mammals one genotype (ee) prevents any fur color from developing. C) In fruit flies white eyes can be due alleles of a gene on the X chromosome or a combination of other genes. D) In cacti, there several genes control the type of spines. Answer: B Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G9, V&C LO: VC-E 42) A radish is a root vegetable that produces flowers that may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant trait. If true-breeding red- flowered, long radishes long radishes are crossed with true-breeding white oval radishes, the F1 will be expected to exhibit which of the following phenotypes? A) red and oval B) white and long C) purple and long D) purple and oval Answer: C Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 43) Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The flower color trait in radishes is an example of which of the following inheritance patterns? A) a multiple allelic system B) sex linkage C) codominance D) incomplete dominance Answer: D Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.3 Global LO: G9, V&C LO: VC-E 15 Copyright © 2021 Pearson Education, Inc. 44) Skin color in a certain species of fish is inherited via a single gene with four different alleles. Each allele confers a unit of color darkness such that having allele S1 confers one unit of color, S2 has two units, S3 has three units, and S4 confers four units. A fish of this type has the genotype S1S3, and its mate has the genotype S2S4. What proportion of their offspring would be expected to have five units of color? A) 1/4 B) 1/8 C) 1/2 D) 0 Answer: C Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 45) Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. Also, a second gene, N, determines whether or not cacti have spines. Homozygous recessive nn cacti have no spines at all. The relationship between genes S and N is an example of which of the following inheritance patterns? A) incomplete dominance B) epistasis C) pleiotropy D) codominance Answer: B Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 46) Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. Also, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. What phenotypes would be expected from a cross between a true-breeding sharp- spined cactus and a spineless cactus? A) all sharp-spined progeny B) 50% sharp-spined, 50% dull-spined progeny C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny D) It is impossible to determine the phenotypes of the progeny. Answer: A Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G9, V&C LO: VC-E 16 Copyright © 2021 Pearson Education, Inc. 47) Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. A second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. Which of the following explain why a crossing a true breeding spineless cactus with a dull-spined cactus could result in both sharp- and dull-spined offspring? A) Gene S genotype is pleiotropic B) Sharp-spined cacti are more successful in environments with predators C) The spineless cactus was heterozygous at the S locus D) Gene N genotype is polygenic Answer: C Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 48) Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. A second gene, N, determines whether or not cacti have spines. Homozygous recessive nn cacti have no spines at all. If cacti heterozygous for both traits, SsNn, were allowed to self-pollinate, the offspring would segregate into which of the following phenotype ratios? A) 3 sharp-spined:1 spineless B) 1 sharp-spined:2 dull-spined:1 spineless C) 1 sharp-spined:1 dull-spined:1 spineless D) 9 sharp-spined:3 dull-spined:4 spineless Answer: D Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 49) Feather color in budgies is determined by two different genes: Y for pigment on the outside of the feather, and B for pigment on the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white. A blue budgie is crossed with a white budgie. Which of the following results in the offspring is most possible? A) green offspring only B) white offspring only C) blue offspring only D) blue and white offspring Answer: D Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 17 Copyright © 2021 Pearson Education, Inc. 50) Feather color in budgies is determined by two different genes, Y for pigment on the outside of the feather, and B for pigment on the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white. Two blue budgies were crossed. Over the years, they produced 22 offspring, five of which were white. What are the most likely genotypes for the two blue budgies? A) yyBB and yyBB B) yyBB and yyBb C) yyBb and yyBb D) yyBb and yybb Answer: C Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 51) In human blood types, Rh positive is a trait that shows simple dominance over Rh negative. The Rh phenotype is recorded by stating "positive" or "negative" after the individuals ABO blood type. A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Which of the following phenotypes is possible for the father? A) A negative B) O negative C) B positive D) AB negative Answer: C Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 52) A gene for the MN blood group has codominant alleles M and N. If both children in a family are of blood type M, which of the following situations is possible? A) each parent is either M or MN B) each parent must be type M C) both children are heterozygous for this gene D) neither parent can have the N allele Answer: A Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 18 Copyright © 2021 Pearson Education, Inc. 53) Marfan syndrome in humans is caused by an abnormality of the connective tissue protein fibrillin. Patients are usually very tall and thin, with long spindly fingers, curvature of the spine, sometimes weakened arterial walls, and sometimes eye problems, such as lens dislocation. Which of the following would you conclude about Marfan syndrome from this information? A) It is recessive. B) It is dominant. C) It is pleiotropic. D) It is epistatic. Answer: C Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.3 Global LO: G2, V&C LO: VC-E 54) In rabbits, the homozygous genotype LCLC has straight legs, LCLc results in deformed legs, and LcLc results in very short legs. The genotype FBFB produces black fur, FBFb brown fur, and FbFb white fur. If a cross is made between brown rabbits with deformed legs and white rabbits with deformed legs, what percent of the offspring would be expected to have deformed legs and white fur? A) 25% B) 33% C) 50% D) 100% Answer: A Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 55) Which of the following relationships among alleles of a single gene best explains the observation that a single change in the gene encoding α-keratin results in chickens with frizzled feathers, increased food consumption, higher heart rate and delayed sexual maturity? A) Incomplete dominance B) Homozygous locus C) Codominance D) Pleiotropy Answer: D Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 19 Copyright © 2021 Pearson Education, Inc. 56) Which of the following statements correctly explains the observation that parents with two different phenotypes produced offspring with a phenotype that is a blend of the two parental varieties? A) Neither of the parental alleles is dominant over the other. B) Both of the parents have dominant alleles. C) Neither of the parental alleles is expressed in the offspring D) Both of the parents are homozygous at that locus Answer: A Topic: Inheritance patterns are often more complex than predicted by simple Mendelian genetics Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.3 Global LO: G1, V&C LO: VC-E 57) An obstetrician knows that her patient's fetus is at risk for a serious disorder that is detectable biochemically in fetal cells. The obstetrician would most reasonably offer which of the following procedures to her patient? A) karyotyping of the woman's somatic cells B) sonogram C) amniocentesis or CVS D) blood transfusion Answer: C Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.4 Global LO: G9, V&C LO: VC-E 58) In some parts of Africa, the frequency of individuals who are heterozygous for the sickle-cell anemia allele is higher than the frequency in North America, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following? A) Mendel's law of independent assortment B) Mendel's law of segregation C) Darwin's theory of natural selection D) Punnett square's modelling inheritance Answer: C Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.4 Global LO: G5, V&C LO: VC-E 20 Copyright © 2021 Pearson Education, Inc. 59) Phenylketonuria (PKU) is a recessive human disorder in which an individual cannot appropriately break down the amino acid phenylalanine. This amino acid is not naturally produced by humans. Which of the following treatments would be most effective for people with PKU? A) Feed the individual the substrate that can be metabolized into phenylalanine. B) Regulate the individual's diet to severely limit the uptake of phenylalanine. C) Feed the individual the missing enzymes in a regular cycle, such as twice per week. D) Feed the individual an excess of the missing product. Answer: B Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 1-2: Remembering/Understanding Learning Outcome: 14.4 Global LO: G9, V&C LO: VC-E 60) Hutchinson-Gilford progeria is an exceedingly rare human genetic disorder in which individuals look very old even as young children, experience very early senility and severe coronary artery disease, and have a life expectancy of 13 years. Which of the following statements represents the most likely assumption regarding this disorder? A) The disorder may be due to the patient being exposure to an environmental mutagen as an infant. B) The disorder will increase in frequency in successive generations within a family. C) The disorder may be due to mutation in a single protein-coding gene. D) Each patient will have had at least one affected grandparent or parent. Answer: C Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 5-6: Evaluating/Creating Learning Outcome: 14.4 Global LO: G9, V&C LO: VC-SF 61) One of two major forms of neurofibromatosis results from inheriting a dominant allele of a gene with affected individuals having phenotypes that range from mild to very severe. Which of the following is the best explanation for why a young child is the first in her family to be diagnosed with a severe form of the condition? A) The mother carries the gene but does not express it. B) One of the parents has a mild expression of the gene. C) The condition skipped a generation in the family. D) The child has one more chromosome than either of the parents. Answer: B Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 5-6: Evaluating/Creating Learning Outcome: 14.4 Global LO: G2, V&C LO: VC-S 21 Copyright © 2021 Pearson Education, Inc. 62) The following question refers to the figure of a family's pedigree chart, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. What is the genotype of individual II-5? A) WW B) Ww C) ww D) ww or Ww Answer: C Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.4 Global LO: G3, V&C LO: VC-E 22 Copyright © 2021 Pearson Education, Inc. 63) The following question refers to the figure of a family's pedigree chart, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. What is the likelihood that a future child of IV-3 and IV-4 will have the trait? A) 0% B) 50% C) 75% D) 100% Answer: B Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.4 Global LO: G3, V&C LO: VC-E 23 Copyright © 2021 Pearson Education, Inc. 64) The following question refers to the figure of a family's pedigree chart, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. What is the probability that individual III-1 is Ww? A) 3/4 B) 1/4 C) 2/4 D) 1 Answer: D Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.4 Global LO: G3, V&C LO: VC-E 24 Copyright © 2021 Pearson Education, Inc. 65) The figure shows the pedigree of a family. Dark-shaded symbols represent individuals with one of the two major types of colon cancer. Numbers under the symbols are the individual's age at the time of diagnosis. Males are represented by squares, females by circles. Based on this pedigree, this trait is most likely inherited ________. A) by older individuals B) as a recessive trait C) as a result of epistasis D) as a dominant trait Answer: D Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.4 Global LO: G3, V&C LO: VC-E 66) Human civilizations developed practices regarding inheritance before the scientific grounding of the practices had been determined. Which of the following genetic principles provides scientific support for the societal taboo against closely related people having children? A) Heterozygous loci can mask harmful traits in an individual. B) Not all harmful dominant alleles can affect reproduction. C) Recessive disorders are relatively common. D) A common environment can influence the severity of harmful traits. Answer: A Topic: Many human traits follow Mendelian patterns of inheritance Bloom's Taxonomy: Levels 3-4: Applying/Analyzing Learning Outcome: 14.4 Global LO: G2, V&C LO: VC-E 25 Copyright © 2021 Pearson Education, Inc.