Question

In Drosophila, XXY is female. In humans it represents an abnormal male because.

• A. Y-chromosome induced male traits in humans
• B. Y-chromosome is not essential for male sex in humans
• C. None of the above
• D. Y-chromosome is essential for female sex in Drosophila

Answer 1

Answer: (A)

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 determines were located on autosomes. One X and two autosomes produce male while two X (X, X) and two autosomes produce female.

So, the correct answer us 'Y-chromosome induced male traits in humans'.