NEET Biology question

In *Drosophila* the XXY condition leads to femaleness, whereas in human beings the same condition leads to Klinefelter's syndrome in a male. It proves

(A)In human beings, the Y chromosome is active in sex determinationCorrect
(B)Y chromosome is active in sex determination in both human beings and *Drosophila*
(C)In *Drosophila*, the Y chromosome decides femaleness
(D)The Y chromosome of man has genes for the syndrome (i.e., disease-causing genes, unrelated to sex determination)

Answer: (A)

Solution

In *Drosophila*, sex is determined by the ratio of X-chromosomes to autosome sets (the genic balance theory), and the Y-chromosome plays no role in sex determination — hence an XXY fly, having an X:A ratio typical of a female, develops as female. In humans, by contrast, an XXY individual develops as a (albeit

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Question ID VK-120183