In human beings, sex is determined

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at the time of fertilisation

on the 16^thday after fertilisation

based on the number of allosomes

based on the number of X chromosomes

answer is A.

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Detailed Solution

Sex is determined in human beings at the time of fertilisation.

There is an equal probability of fertilisation of the ovum with the sperm carrying either X or Y chromosome.

In case the ovum fertilises with a sperm carrying X-chromosome, the zygote develops into a female (XX). The fertilisation of ovum with sperm carrying Y chromosome results into a male offspring.

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