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Question

In human beings, sex of an individual is determined:


A

During the initial stages of pregnancy

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B

At the time of fertilization

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C

During the later stages of pregnancy

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D

By the environmental factors

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Solution

The correct option is B

At the time of fertilization


The sex of the child depends on the type of sperm that fertilises the egg. Each egg contains one X chromosome and a sperm may have either an X or a Y chromosome. It is a matter of chance as to which type of sperm fertilises the ovum. If the egg (having X chromosome) is fertilised by a X-bearing sperm, the resulting combination is XX i.e., female. If the egg (having X chromosome) is fertilised by a Y-bearing sperm, the resulting combination is XY i.e., male.


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