White coat (W) is dominant over tan (w) coat in foxes. When a white-coated male is mated with a tan-coated female, 100% of their offspring are white-coated. What is the genotype of the female fox?

Question

Responses
A WWWW
B WwWw
C wWwW
D ww

Answer 1

Since the white-coated male is mated with a tan-coated female and all offspring are white-coated, we can conclude the following:

1. The white-coated male must have the genotype WW because he can only pass on the dominant allele (W) to his offspring.
2. The tan-coated female must have the genotype ww because tan (w) is recessive, so in order for her to express the tan coat, she must have two copies of the recessive allele.

Since the question asks for the genotype of the female fox, the correct answer is:

D. ww