Black fur in mice (b) is dominant to brown fur (b). Short tails (S) are dominant to long tails (s). What fraction of the progeny of crosses BbSs × BBss will be expected to have black fur and long tails?

Question

Quizplus · Accepted Answer

The cross BbSs × BBss results in offspring with genotypes: BBSs, BBss, BbSs, Bbss. All offspring will have black fur (BB or Bb). For tails, 1/2 will have long tails (ss). Therefore, 1/2 of the progeny will have black fur and long tails.

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