A fruit fly is heterozygous for sex-linked ge | vedclass

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(A) In fruit flies ($Drosophila$ $melanogaster$),the sex determination is of the $XY$ type. When a male is heterozygous for sex-linked genes,he posses

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(A) In fruit flies ($Drosophila$ $melanogaster$),the sex determination is of the $XY$ type. When a male is heterozygous for sex-linked genes,he possesses one $X$ chromosome and one $Y$ chromosome. During meiosis,the $X$ chromosome and the $Y$ chromosome segregate into different gametes. As a result,$50\%$ of the sperm cells receive the $X$ chromosome and $50\%$ receive the $Y$ chromosome. Therefore,the ratio of male-specific chromosomes ($X$ and $Y$) entering the gametes is $1:1$.

$A$ fruit fly is heterozygous for sex-linked genes and is mated with a normal female fruit fly. In what proportion will the male-specific chromosomes enter the egg cells (in $:1$)?

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