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.
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.
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