Question

What determines the sex of a baby?


Answers (1)

by Qcrew 12 years ago

Every egg and sperm contains 23 chromosomes. Each egg has one X chromosome while every sperm has either one X chromosome or Y chromosome. The sex of a baby is determined by where the sperm that fertilises the egg carries the X or Y chromosome.

If the sperm with X chromosome fertilised the egg, it will be a girl. If the sperm with Y chromosome fertilised the egg, it will be a boy.


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