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Fetal Development

How is the sex of a baby determined?

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2010-04-25 23:13:37
2010-04-25 23:13:37

It's determined by the genetic chromosome of the sperm. Women have only one X chromosome in the egg (both egg and sperm have 23 pairs of chromosomes, which unite to form 46). On the other hand, men have either X or Y chromosomes.

If an egg (X chromosome) joins with an X chromosome sperm, the result will be a girl. If an egg (X chromosome) joins with a Y chromosome sperm, the result will be a boy.

In other words: the guy determines the sex of a baby :)

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