Question

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.

Answer 1

Answer:

Proportion of  offspring  to have a red coat is

$\frac{3}{16}$

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

AB AABB AABb AaBB AaBb

Ab AABb AAbb AaBb Aabb

aB AaBB AaBb aaBB aaBb

ab AaBb Aabb aaBb aabb

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

$\frac{3}{16}$