How Is The Baby’s Sex Determined?

A women’s egg cells and a man’s sperm cells each contain 23 single chromosomes, which are not paired until they meet their opposite number. Of the 23 single chromosomes, one is always a sex chromosome. 

Each egg always has an X (female) sex chromosome, but the sex chromosome present in any sperm can be either X (female) or Y (male). Hence, the sex of the baby is dependent on which type of sperm cell fertilizes the egg. The sex of the baby is determined at conception.

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