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Questions and Answers
Considering three genes on separate chromosomes (A, B, C), what is the total number of distinct gamete genotypes that a diploid organism with the genotype AaBbCc can produce?
Considering three genes on separate chromosomes (A, B, C), what is the total number of distinct gamete genotypes that a diploid organism with the genotype AaBbCc can produce?
- 8 (correct)
- 16
- 6
- 4
If an organism with the genotype AaBBCc is crossed with an organism with the genotype aaBbCc, how many different phenotypic combinations are potentially possible in their offspring, considering complete dominance for each gene?
If an organism with the genotype AaBBCc is crossed with an organism with the genotype aaBbCc, how many different phenotypic combinations are potentially possible in their offspring, considering complete dominance for each gene?
- 8
- 12 (correct)
- 6
- 4
In dogs, wiry hair (W) is dominant to smooth hair (w). If a heterozygous wiry-haired dog is crossed with a smooth-haired dog, what proportion of the offspring is expected to have smooth hair?
In dogs, wiry hair (W) is dominant to smooth hair (w). If a heterozygous wiry-haired dog is crossed with a smooth-haired dog, what proportion of the offspring is expected to have smooth hair?
- 75%
- 25%
- 50% (correct)
- 0%
A breeder has a wiry-haired dog of unknown genotype. To determine if the dog is homozygous (WW) or heterozygous (Ww), they perform a test cross. Which of the following describes the MOST appropriate test cross?
A breeder has a wiry-haired dog of unknown genotype. To determine if the dog is homozygous (WW) or heterozygous (Ww), they perform a test cross. Which of the following describes the MOST appropriate test cross?
In pea plants, smooth pods (S) are dominant to constricted pods (s), and yellow seeds (Y) are dominant to green seeds (y). If you cross a plant that is ssYy with a plant that is SsYy, what proportion of the offspring is expected to have constricted pods and yellow seeds?
In pea plants, smooth pods (S) are dominant to constricted pods (s), and yellow seeds (Y) are dominant to green seeds (y). If you cross a plant that is ssYy with a plant that is SsYy, what proportion of the offspring is expected to have constricted pods and yellow seeds?
Mendel used homozygous lines in his experiments. What is the MOST significant reason for using these lines?
Mendel used homozygous lines in his experiments. What is the MOST significant reason for using these lines?
Two organisms have the same phenotype for a particular trait, but different genotypes. Which of the following BEST explains how this is possible?
Two organisms have the same phenotype for a particular trait, but different genotypes. Which of the following BEST explains how this is possible?
A plant with the genotype AABBCC is crossed with a plant with the genotype aabbcc. Assuming independent assortment, what proportion of the F2 generation will have the same genotype as the F1 generation?
A plant with the genotype AABBCC is crossed with a plant with the genotype aabbcc. Assuming independent assortment, what proportion of the F2 generation will have the same genotype as the F1 generation?
Flashcards
Alleles
Alleles
Different versions of a gene at a specific locus.
Genotype
Genotype
The genetic makeup of an organism; the specific combination of alleles.
Phenotype
Phenotype
The observable characteristics of an organism, resulting from the interaction of its genotype with the environment.
Homozygous
Homozygous
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Heterozygous
Heterozygous
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Dominant Trait
Dominant Trait
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Recessive Trait
Recessive Trait
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Mendel's Law of Segregation
Mendel's Law of Segregation
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Study Notes
- These questions are practice problems to aid in the understanding of genetics.
Gamete Combinations From Diploid Genotypes
- Three genes (A, B, and C) are found on three different chromosomes.
- Determine the possible gamete combinations for the following diploid genotypes:
- AaBbCc
- AABbCC
- AaBBCc
- aaBbCc
- Aabbcc
Offspring Phenotypes
- Determine how many different phenotypes could possibly result from a cross of organism c (AaBBCc) and organism d (aaBbCc).
- Account for all combinations.
- “D” represents the dominant trait, and “r” represents the recessive trait.
Wiry Hair in Dogs
- Wiry hair (W) is dominant to smooth hair (w) in dogs.
- Consider a cross between a homozygous wiry-haired dog and a smooth-haired dog:
- Determine the genotype and phenotype of the F1 generation.
- If two dogs from the F1 generation are mated:
- Determine the most likely ratio of hair phenotypes among their progeny.
- A wiry-haired dog has been left on a doorstep:
- Determine the easiest way to determine the genotype of this dog without extracting DNA.
Pea Plant Cross
- A cross is made between two pea plants:
- Plant 1: constricted pods (recessive trait), heterozygous for seed color (yellow dominant to green)
- Plant 2: heterozygous for both pod texture and seed color.
- Construct a Punnett square and depict this cross.
- Predict outcome of the genotypes and phenotypes of the offsprings.
Mendel’s Homozygous Lines
- Mendel used homozygous lines as parents for his crosses.
- Explain how he knew they were homozygous.
- Explain his reasoning for why the use of these lines were important.
Genotype vs. Phenotype
- Genotype refers to the genetic makeup of an organism.
- Phenotype refers to the observable characteristics or traits.
- It is possible for multiple organisms to have the same phenotype but a different genotype.
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Description
Practice problems covering gamete combinations, offspring phenotypes, and Mendelian inheritance. Includes determining gamete combinations from diploid genotypes and predicting offspring ratios for Mendelian traits. An exercise explores inheritance of wiry hair in dogs.
