NEET 2000 Biology question

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

(1)In human beings Y chromosome is active in sex determinationCorrect
(2)Y chromosome is active in sex determination in both human beings and Drosophila
(3)In Drosophila Y-chromosome decides femaleness
(4)Y chromosome of man have genes for syndrome

Answer: (1)

Solution

In Drosophila sex is determined by the ratio of X chromosomes to sets of autosomes (X : A); XXY has X : A = 1.0 and is a female, so the Y chromosome plays no role in sex determination (it is needed only for male fertility). In humans XXY is a male with Klinefelter's syndrome because the Y chromosome carries the

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Question ID VK-088719