You picked up two mice (one female and one male)that had escaped from experimental cages in the animalfacility. One mouse is yellow in color, and the other isbrown agouti. (Agouti hairs have bands of yellow,while non-agouti hairs are solid-colored.) You knowthat this mouse colony has animals with different alleles at only three coat color genes: the agouti (A) ornon-agouti (a) or yellow (AY) alleles of the A gene(AY> A > a; AYis a recessive lethal), the black (B) orbrown (b) alleles of the B gene (B > b), and the albino(c) or non-albino (C) alleles of the C gene (C > c; cc isepistatic to all other phenotypes). However, you don’tknow which alleles of these genes are actually presentin each of the animals that you’ve captured. To determine the genotypes, you breed the two escaped mice together. The first litter has only three pups. One is albino,one is brown (non-agouti), and the third is black agouti.a. What alleles of the A, B, and C genes are present inthe two mice you caught?b. After raising several litters from these two parents,you have many offspring. How many different coatcolor phenotypes (in total) do you expect to see expressed in the population of offspring? What arethe phenotypes and corresponding genotypes?
You picked up two mice (one female and one male)
that had escaped from experimental cages in the animal
facility. One mouse is yellow in color, and the other is
brown agouti. (Agouti hairs have bands of yellow,
while non-agouti hairs are solid-colored.) You know
that this mouse colony has animals with different alleles at only three coat color genes: the agouti (A) or
non-agouti (a) or yellow (AY
) alleles of the A gene
(AY
> A > a; AY
is a recessive lethal), the black (B) or
brown (b) alleles of the B gene (B > b), and the albino
(c) or non-albino (C) alleles of the C gene (C > c; cc is
epistatic to all other
know which alleles of these genes are actually present
in each of the animals that you’ve captured. To determine the genotypes, you breed the two escaped mice together. The first litter has only three pups. One is albino,
one is brown (non-agouti), and the third is black agouti.
a. What alleles of the A, B, and C genes are present in
the two mice you caught?
b. After raising several litters from these two parents,
you have many offspring. How many different coat
color phenotypes (in total) do you expect to see expressed in the population of offspring? What are
the phenotypes and corresponding genotypes?
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