Class 8 Biology Reaching the Age of Adolescence Determining sex of a baby

Determining sex of a baby

The sex of baby is depends upon the chromosome.

Chromosomes are thread like structures

Present in human beings as a set of 23 pairs. Two of which are sex chromosomes named X and Y.

A female child has two X chromosomes whereas a male child has one X and one Y chromosome.

The male and female gamates have only one set of chromosomes.

An unfertilised egg has one X chromosome.

But different sperms carry different chromosome i.e. X as well as Y.

If a sperm containig X chromosome fertilises the egg then the resulting fertilised egg contains two X chromosomes that will give birth to a baby girl whreas if a sperm containing Y chromosome fertilises the egg then the resulting egg contains one X and one Y chromosome that gives birth to a baby boy.

 

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