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%

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Quizplus · Accepted Answer

The genes are 25 map units apart, indicating a 25% recombination frequency. In the cross, 50% of the male progeny will inherit the recombinant X chromosome (w+sn) from the female, and 25% of these will be w+sn due to recombination. Thus, 12.5% of the total male progeny will be w+sn.

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