In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in males. It proves:
In human beings, the Y chromosome is active in sex determination.
Y chromosome is active in sex determination in both human beings and Drosophila.
In Drosophila Y-chromosome decides femaleness.
The Y chromosome of man has genes for the syndrome.
, in humans, the Y chromosome carries the decisive factor for male sex determination. The presence of a Y chromosome, even in the presence of extra X chromosomes (as seen in Klinefelter's syndrome, 47,XXY), results in a male phenotype (masculine development) . In contrast, the question states that XXY is female in Drosophila, indicating that the Y chromosome does not determine maleness in fruit flies (where sex is determined by the ratio of X chromosomes to autosomes). This comparison proves that the Y chromosome is the active sex-determining element in humans.
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