A) Y-chromosome is essential for sex determination in Drosophila
B) Y-chromosome is female determinating in Drosophila
C) Y-chromosome is male determining in human beings
D) Y-chromosome has no role in sex determination either in Drosophila or in human beings
Correct Answer: C
Solution :
In human beings, the presence of a Y- chromosome is required for the development of a male sex phenotype. X-chromosomes present in any number (XXX, XXXX) in the absence of a Y-chromosome gives rise to female. Presence of even a single Y-chromosome confers maleness. In Drosophila, Y-chromosome plays no significant role in sex determination. In Drosophila male determiners were located on autosomes. One X and two autosomes produce male while two X (X, X) and two autosomes produce female.
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