In Drosophila,the XXY condition results in a | vedclass

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(A) In $Drosophila$,sex is determined by the ratio of $X$ chromosomes to the number of sets of autosomes ($X/A$ ratio). The presence of the $Y$ chromo

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The $Y$ chromosome is active in sex determination in humans.

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(A) In $Drosophila$,sex is determined by the ratio of $X$ chromosomes to the number of sets of autosomes ($X/A$ ratio). The presence of the $Y$ chromosome does not determine maleness in $Drosophila$; it is only required for male fertility. Thus,$XXY$ is a female.In humans,sex is determined by the presence of the $SRY$ gene located on the $Y$ chromosome. The presence of even a single $Y$ chromosome triggers the development of testes,leading to a male phenotype. Therefore,$XXY$ results in a male with $Klinefelter's$ syndrome. This confirms that the $Y$ chromosome is essential for sex determination in humans.

In $Drosophila$,the $XXY$ condition results in a female,whereas in humans,the same condition results in a male with $Klinefelter's$ syndrome. This proves that:

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