A new mutation inDrosophilais found called peach, which causes a peach-like body color. A peach male is crossed to a homozygous wild-type female and the offspring consists of peach females and normal males. If a heterozygous peach female is crossed to a normal male, the offspring consists of ¹/₄ peach females, ¹/₄ normal females, ¹/₄ peach males, and ¹/₄ normal males. What is the MOST likely mode of inheritance for peach?

Question

Quizplus · Accepted Answer

The inheritance pattern suggests that the peach mutation is X-linked and dominant. The initial cross results in peach females and normal males, indicating that the trait is linked to the X chromosome and dominant, as the females inherit the mutant allele from their father. The subsequent cross results in a 1:1:1:1 ratio, consistent with X-linked dominant inheritance.

A New Mutation InDrosophilais Found Called Peach, Which Causes a Peach-Like