A fruit fly is heterozygous for sex-linked genes. When mated with a normal female fruit fly, the male-specific chromosome will enter egg cells in the proportion of

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1 : 1. A heterozygous male has two different sex chromosomes (or sex-linked alleles on them), and meiosis separates them equally into gametes. Therefore, the male-specific chromosome appears in half the gametes, giving a 1:1 proportion.

A fruit fly is heterozygous for sex-linked genes. When mated with a normal female fruit fly, the male-specific chromosome will enter egg cells in the proportion of

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