Is it okay to have boys and girls?

I can't know if I have a boy or a girl before I get pregnant.

Because male semen contains two kinds of sperm,

One is sperm with X chromosome,

One is sperm with y sex chromosome,

It depends on which sperm is combined with which egg.

If the sperm with X sex chromosome is combined with the egg, the fertilized egg will have XX sex chromosome and give birth to a girl.

Sperm with Y sex chromosome is combined with egg, and fertilized egg with XY sex chromosome will give birth to a boy.

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