A) Y-chromosome is essential for sex determination in Drosophila.
B) Y-chromosome is female determinant in Drosophila.
C) Y-chromosome is male determination in human beings.
D) Y-chromosome has no role in sex determination either in Drosophila or in human beings.
Correct Answer: C
Solution :
[c] Sex in Drosophila is a function of the ratio of the number of X chromosomes to the number of autosomal sets. Therefore a Drosophila with a X/A =1.0 will be a female whereas the one with a X/A ratio =0.5 will be male. However, in humans the presence or absence of the Y chromosome determines sex.
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