The Mouse Autosomal Genes B and S Are Linked and 38

Multiple Choice

The mouse autosomal genes B and S are linked and 38 map units apart.Genotypes B S/B S and b s/b s are intercrossed,and the F₁ is testcrossed to b s/b s.The proportion of B-S- progeny will be:

A) 0.19.
B) 0.31.
C) 0.50.
D) 0.38.
E) 0.76.