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

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(A) In fruit flies $(Drosophila)$,sex determination follows the $XY$ system where the female is $XX$ and the male is $XY$.If a male is heterozygous fo

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(A) In fruit flies $(Drosophila)$,sex determination follows the $XY$ system where the female is $XX$ and the male is $XY$.If a male is heterozygous for a sex-linked gene,it means the gene is located on the $X$ chromosome.When a heterozygous male $(X^A Y)$ is crossed with a normal female $(X^A X^A)$,the gametes produced by the male are $X^A$ and $Y$ in a $1:1$ ratio.Since the question asks for the ratio in which the specific chromosome for the male ($Y$ chromosome) enters the egg (or rather,the ratio of gametes containing $X$ vs $Y$),the segregation of sex chromosomes during meiosis results in $50\%$ $X$-bearing sperm and $50\%$ $Y$-bearing sperm.Thus,the ratio is $1:1$.

$A$ fruit fly is heterozygous for a sex-linked gene. It is crossed with a normal female fruit fly. The specific chromosome for the male enters the egg in the ratio of ............. (in $: 1$)

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