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Question

In humans, the sex of the baby is determined_________.

A
at the time of implantation and by the maternal gamete
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B
at the time of implantation and by the paternal gamete
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C
at the time of fertilization and by the maternal gamete
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D
at the time of fertilization and by the paternal gamete
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Solution

The correct option is D at the time of fertilization and by the paternal gamete
Sex determination occurs at the time of fertilization and only by the father in humans. Father has heterogenous sex chromosomes X and Y, while in the case of mother, they have homogenous sex chromosomes XX .The possible combinations are XX, XY, XY and XX with the mother being the contributor of X chromosome only in all the four combinations. Hence, embryo’s sex is decided by the father's X or the Y chromosome present in the sperm that fertilizes the egg.

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