Inheritance Past Paper PDF
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Uploaded by DR.MOATAZ
2025
OCR
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Summary
This document appears to be a multiple choice exam paper on inheritance in biology, likely from a recent OCR exam in 2025. The paper covers various topics related to heredity, genotypes, and phenotypes. It includes questions relating to the work from Gregor Mendel.
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INHERITANCE Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. The passing of traits from parents to offspring is called a. genetics. c. development. b. heredity....
INHERITANCE Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. The passing of traits from parents to offspring is called a. genetics. c. development. b. heredity. d. maturation. ____ 2. The difference between Mendel’s experiments in the area of heredity and those done by earlier researchers was that R EST 202 a. earlier researchers did not have microscopes. F O b. earlier researchers used detailed and numerical procedures. Y OG 5 c. Mendel expressed the results of his experiments in terms of numbers. d. Mendel used pea plants with both purple and white flowers. ____ 3. The scientific study of heredity is called L a. meiosis. c. genetics. BIO b. crossing-over. d. pollination. T A Z ____ 4. The “father” of genetics was A a. A. Knight. c. Gregor Mendel. O b. Hans Krebs. d. Charles Darwin. R. M ____ 5. Garden peas are good subjects for studying heredity because they D a. are difficult to grow. c. produce few offspring. b. mature quickly. d. have few traits. ____ 6. Mendel obtained his P generation by allowing the plants to a. self-pollinate. c. assort independently. b. cross-pollinate. d. segregate. ____ 7. Step 1 of Mendel’s garden pea experiment, allowing each variety of garden pea to self-pollinate for several generations, produced the a. F1 generation. c. P generation. b. F2 generation. d. P1 generation. 0 3 1 002011109 83 ____ 8. F2 : F1 :: a. P : F1 c. F1 : P b. F1 : F2 d. P : F2 ____ 9. An allele that is always expressed whenever it is present is called a. dominant. c. recessive. b. phenotypic. d. superior. ____ 10. The discovery of chromosomes provided a link between the first law of heredity that stemmed from Mendel’s work and a. pollination. c. mitosis. b. inheritance. d. meiosis. ____ 11. The law of segregation states that a. alleles of a gene separate from each other during meiosis. b. different alleles of a gene can never be found in the same organism. c. each gene of an organism ends up in a different gamete. d. each gene is found on a different molecule of DNA. ____ 12. Mendel’s law of segregation states that a. pairs of alleles are dependent on one another when separation occurs during gamete formation. b. pairs of alleles separate independently of one another after gamete formation. c. each pair of alleles remains together when gametes are formed. d. the two alleles for a trait segregate independently when gametes are formed. ____ 13. The phenotype of an organism a. is used to represent its genetic composition. R EST 202 b. is the physical appearance of a trait. F c. occurs only in dominant individuals. Y O 5 d. cannot be seen. a. homozygous for the trait. OG ____ 14. If an individual possesses two recessive alleles for the same trait, the individual is said to be c. heterozygous for the trait. L b. haploid for the trait. d. mutated. BIO Z ____ 15. When an individual heterozygous for a trait is crossed with an individual homozygous recessive for the T A trait, the offspring produced will A a. all have the same genotype. O b. show two different phenotypes. R. M c. show three different phenotypes. d. all have the same phenotype. D ____ 16. Tallness (T) is dominant to shortness (t) in pea plants. Which of the following represents a genotype of a pea plant that is heterozygous for tallness? a. T c. Tt b. TT d. tt ____ 17. homozygous : heterozygous :: a. heterozygous : Bb c. probability : chance b. gg : Gg d. factor : gene 3 ____ 18. Mendel’s finding that the inheritance of one trait had no effect on the inheritance of another became 0 1 83 known as the a. law of dominance. b. law of universal inheritance. c. law of separate convenience. 002011109 d. law of independent assortment. In humans, having freckles (F) is dominant to not having freckles (f). The inheritance of these traits can be studied using a Punnett square similar to the one shown below. F O R EST 202 OG Y 5 L BIO Z ____ 19. Refer to the illustration above. The child represented in box 1 in the Punnett square would T A a. be homozygous for freckles. A b. have an extra freckles chromosome. O c. be heterozygous for freckles. R. M d. not have freckles. D ____ 20. Refer to the illustration above. The parents shown in the Punnett square could have children with a phenotype ratio of a. 1:2:1. c. 3:1. b. 4:0. d. 2:2. ____ 21. Refer to the illustration above. Which box in the Punnett square represents a child who does not have freckles? a. box 1 c. box 3 b. box 2 d. box 4 0 3 ____ 22. Refer to the illustration above. The child in box 3 of the Punnett square has the genotype 1 002011109 83 a. FF. c. ff. b. Ff. d. FfFf. In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits. F O R EST 202 genetic crosses, is called a a. Mendelian box. b. Punnett square. Y 5 ____ 23. Refer to the illustration above. The device shown, which is used to determine the probable outcome of OG c. genetic graph. d. phenotypic paradox. L BIO ____ 24. Refer to the illustration above. Both of the parents in the cross are Z a. black. c. homozygous dominant. T A b. brown. d. homozygous recessive. O A ____ 25. Refer to the illustration above. The phenotype of the offspring indicated by box 3 would be R. M a. brown. c. a mixture of brown and black. b. black. d. white. D ____ 26. Refer to the illustration above. The genotypic ratio of the F1 generation would be a. 1:1. c. 1:3. b. 3:1. d. 1:2:1. ____ 27. What is the expected genotypic ratio resulting from a homozygous dominant heterozygous monohybrid cross? a. 1:0 c. 1:2:1 b. 1:1 d. 1:3:1 3 ____ 28. What is the expected genotypic ratio resulting from a heterozygous heterozygous monohybrid cross? 0 1 83 a. 1:2:1 c. 1:2 b. 1:3:1 002011109 d. 1:0 ____ 29. What is the expected phenotypic ratio resulting from a homozygous dominant heterozygous monohybrid cross? a. 1:3:1 c. 2:1 b. 1:2:1 d. 1:0 ____ 30. The unknown genotype of an individual with a dominant phenotype can be determined using a a. ratio. c. probability formula. b. dihybrid cross. d. test cross. ____ 31. What is the probability that the offspring of a homozygous dominant individual and a homozygous recessive individual will exhibit the dominant phenotype? a. 0.25 c. 0.66 b. 0.5 d. 1.0 ____ 32. Probability is calculated by dividing the number of one kind of possible outcome by the a. number of other kinds of outcomes. b. total number of all possible outcomes. c. number of genes being considered. d. total number of offspring produced. ____ 33. If a characteristic is sex-linked, the gene for it is found on a. a sex chromosome. c. a linked chromosome. b. an autosome. d. an allele. ____ 34. Since the allele for colorblindness is located on the X chromosome, colorblindness a. cannot be inherited. c. is sex-linked. R EST 202 b. occurs only in adults. d. occurs only in females. Y F O ____ 35. A diagram in which several generations of a family and the occurrence of certain genetic characteristics are shown is called a a. Punnett square. b. monohybrid cross. OG 5 c. pedigree. d. family karyotype. L ____ 36. In humans, eye color and height are controlled by BIO Z a. simple dominance. c. polygenic inheritance. T A b. multiple alleles. d. incomplete dominance. O A ____ 37. Which of the following traits is controlled by multiple alleles in humans? R. M a. eye color c. colorblindness b. blood type d. albinism D ____ 38. What would be the blood type of a person who inherited an A allele from one parent and an O allele from the other? a. type A c. type AB b. type B d. type O ____ 39. Which of the following is not an outcome of the environment modifying a phenotype? a. the changing of the color of an animal’s fur as the temperature changes b. the increased intelligence of a person who attended school for many years c. the very short stature of a kind of tree that grows at a high altitude in comparison with the same kind of tree growing at a lower altitude 0 3 1 83 d. the pink-flowered snapdragons that result from crosses between red-flowered and 002011109 white-flowered snapdragon plants ____ 40. Genes that are close together on a single chromosome are considered to be a. alleles. c. independent. b. homozygous. d. linked.