Black fur in mice (B)is dominant to brown fur (b). Short tails (T)are dominant to long tails (t). What fraction of the progeny of crosses BbTt × BBtt will be expected to have black fur and long tails?

Question

Quizplus · Accepted Answer

For black fur, the cross involves Bb (from one parent) and BB (from the other), ensuring all offspring have at least one B allele, resulting in 100% black fur. For tail length, Tt crossed with tt results in a 1:1 ratio of Tt (short tail) to tt (long tail). Therefore, 1/2 of the offspring will have black fur and long tails.

Black Fur in Mice (B)is Dominant to Brown Fur (B)