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

1.	In human beings, the Y chromosome is active in sex determination.
2.	Y chromosome is active in sex determination in both human beings and Drosophila.
3.	In Drosophila Y-chromosome decides femaleness.
4.	The Y chromosome of man has genes for the syndrome.

Subtopic: Sex Aneuploidy - Turner & Klinefelter Syndrome |

Level 3: 35%-60%

AIPMT - 2000

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