In a particular animal, coat color is under the control of two interacting genes. Each gene has a dominant and recessive allele. A = Color, a = Albino, and B = Brown coat color, b = Red coat color. Two AaBb animals are mated. What proportion of their offspring is expected to have a red coat? Assume the genes are assorting independently.

Proportion of  offspring  to have a red coat is

Explanation:

Gametes produced by AaBb animals are AB, Ab, aB, ab

Cross between two AaBb animals would be as follows

AaBb * AaBb

AB        Ab        aB       ab

ABAABBAABbAaBBAaBb

AbAABbAAbbAaBbAabb

aBAaBBAaBbaaBBaaBb

abAaBbAabbaaBbaabb

Out of the 16, offspring the one with genotype Aabb and aabb will have red color

There are 2 Aabb and one aabb offspring.  

Thus, out of 16, 3 offspring are red in color

Proportion of  offspring  to have a red coat is

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