If a female Drosophila that is heterozygous for a recessive X-linked mutation is crossed to a wild-type male, what proportion of female progeny will have the mutant phenotype?

Question

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In Drosophila, females have two X chromosomes. A heterozygous female has one normal allele and one mutant allele. Since the mutation is recessive, the presence of one normal allele will mask the mutant phenotype. Therefore, none of the female progeny will express the mutant phenotype.

If a Female Drosophila That Is Heterozygous for a Recessive