Question

Chickens can be black feathered, white feathered or black & white feathered. For the black & white feathered chickens, both black feathers show in the offspring, as well as white feathers. This is an example of codominance. Using the following information, answer the question below. BB= Black Feathers, WW= White Feathers, BW= Black & White Feathers



A heterozygous chicken has both black and white feathers. If two heterozygous chickens are crossed, what percentage of their offspring will be all white feathered?

A
25%

B
50%

C
75%

D
100%

Answer 1

A — 25%.

Explanation: Cross BW x BW gives genotypes BB, BW, BW, WW (1/4 BB, 1/2 BW, 1/4 WW). Only WW are all white, so 25% of the offspring.