A) in human being Y-chromosome is active in see determination
B) Y-chromosome is active in sex determination in both human being and Drosophila
C) In Drosophila Y-chromosome decides female ness
D) Y-chromosome of man have genes for syndrome
E) None of the above
Correct Answer: A
Solution :
In Drosophila, XXY leads to femaleness. Here, Y has no contributions in femaleness. Sex in Drosophila is determined by the ratio of sex chromosome (X) and autosomes . In human being. XXY condition leads to genetically male with underdeveloped testes, azoospermla, etc. It is caused by the union of a non-disjunction XX egg and a normal X egg and abnormal XY sperm. This indicates that in human being Y-chromosome is active in sex determination.
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