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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 male. It proves :
A
In human beings Y chromosome is active in sex determination
B
Y chromosome is active in sex determination in both human beings and Drosophila
C
In Drosophila Y-chromosome decides femaleness
D
Y chromosome of man has genes for syndrome
Detailed Solution
In Drosophila, sex is decided by the ratio of X chromosomes to sets of autosomes (genic balance). XXY with two sets of autosomes has X/A = 1, so it is female; the Y chromosome does not decide sex.
In humans, XXY individuals are male (Klinefelter's syndrome), because the Y chromosome carries the SRY gene that determines maleness, regardless of the number of X chromosomes.
So this proves that in human beings the Y chromosome is active in sex determination.
In humans, XXY individuals are male (Klinefelter's syndrome), because the Y chromosome carries the SRY gene that determines maleness, regardless of the number of X chromosomes.
So this proves that in human beings the Y chromosome is active in sex determination.