Q.

Which chromosomal combination is responsible for maleness in man?

A. XO
B. XXX
C. XX
D. XY
Answer» D. XY
Explanation: In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.
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