The sex of the baby is determined at the time of

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gametogenesis depending on the type of allosome of the ovum

fertilisation depending on the type of allosome of the ovum

gametogenesis depending on the type of allosome of the sperm

fertilisation depending on the type of allosome of the sperm

answer is C.

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Detailed Solution

The sex of the baby is determined at the time of fertilisation depending on the type of sex chromosome (allosome) of the sperm. All the ova carry X chromosome. Sperms carry either X chromosome or Y chromosome. After fusion of the male and female gametes, the zygote would carry either XX or XY depending on whether the sperm carrying X or Y fertilised the ovum. The zygote carrying XX would develop into a female baby and XY would form a male.

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