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Boy or Girl


Inside the fertilized egg or zygote is the instruction for determining the sex of the baby. This instruction is present in the thread like structures, called chromosomes in the fertilised egg. All human beings have 23 pairs of chromosomes in the nuclei of their cells. Two chromosomes out of these are the sex chromosomes, named X and Y.

A female has two X chromosomes, while a man has one X and one Y chromosome. The gametes (egg and sperm) have only one set of chromosomes. The unfertilised egg always has one X chromosome. But sperms are of two kinds. One kind has an X chromosome and the other kind has Y chromosome.

When a sperm containing X chromosome fertilize with the egg, the zygote would have two X chromosomes and develop into female child. If the sperm contributes a Y chromosome to the egg at fertilisation, the zygote would develop into male child.

The sex chromosomes of the father determine the sex of an unborn baby. The belief that the mother is responsible for the sex of her baby is completely wrong and to blame her for this is totally unjustified.

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