Normal human cells contain 46 chromosomes
in 23 pairs. We receive 23 chromosomes from each of our parents. The first 22 pairs of chromosomes are exactly the same for
men and women. The 23rd pair determines our sex.
A female has two "X" chromosomes, whereas a male has an "X" and a "Y."
As such, the woman can only pass an X to her child in her egg.
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