Coat color in mice (Mus musculus) can show many varieties. You have two true-breeding mouse stains, one with white fur; the other with black fur. Upon crossing a male and female of both strains, you find that all of the offspring show the agouti coat color: agouti is best described as a layered brown color (think of the normal coat color of squirrels and rabbits). Upon crossing agouti males and females, you observe the following traits: 450 agouti mice, 150 mice with black fur, and 200 mice with white fur; reciprocal crosses yield similar results. A. Are these results (the F1 and F2) best explained by one gene with three alleles or two genes, each with two alleles? Explain your answer with text and by using allele symbols to represent the F1 and F2 results. B. What genotypes are associated with each trait? C. What phenomenon is occurring in this scenario? Explain your answer.
Coat color in mice (Mus musculus) can show many varieties. You have two true-breeding mouse stains, one with white fur; the other with black fur. Upon crossing a male and female of both strains, you find that all of the offspring show the agouti coat color: agouti is best described as a layered brown color (think of the normal coat color of squirrels and rabbits).
Upon crossing agouti males and females, you observe the following traits: 450 agouti mice, 150 mice with black fur, and 200 mice with white fur; reciprocal crosses yield similar results.
A. Are these results (the F1 and F2) best explained by one gene with three alleles or two genes, each with two alleles? Explain your answer with text and by using allele symbols to represent the F1 and F2 results.
B. What genotypes are associated with each trait?
C. What phenomenon is occurring in this scenario? Explain your answer.
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