In Drosophila,the Two Genes W and Sn Are X-Linked and 25

Multiple Choice

In Drosophila,the two genes w and sn are X-linked and 25 map units apart.A female fly of genotype w⁺sn⁺/w sn is crossed to a male from a wild-type line.What percent of male progeny will be w⁺sn?

A) 0%
B) 12.5%
C) 25%
D) 37.5%
E) 50%