More specifically, how does a Sperm become X or Y sperm.
In: Biology
Not going too much into the scientificy details, mainly because I don’t remember them from high school 2 decades ago, but basically the cell division that occurs to form the reproductive cells (sperm/eggs) in humans is not the same as the cell division for none reproductive cells.
When the “normal” cells split, they create complete copies of each chromosome pair (your DNA is made of pairs of each chromosome. One comes from the father, one from the mother), so the child cells end up with a complete set of DNA.
Reproductive cells split the chromosome pairs. The child cells only receive one chromosome from each pair. In the case of the sex chromosome pair, a male has an XY pair and a female has an XX pair. So when a male creates reproductive cells (sperm), one sperm will receive the X chromosome and the other will have the Y chromosome.
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