A woman's egg contains 22 chromosomes plus an X-chromosome. Assisted reproduction and birth control". The initial spermatozoon process takes around 70 days to complete. The spermatid stage is where the sperm develops the familiar tail.
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How sperm and eggs develop precisely 23 chromosomes each
Spermatia are produced in a spermatangium. If the sperm carries a Y-chromosome the baby will be XY, a boy. The initial spermatozoon process takes around 70 days to complete.
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This takes place in the mitochondria located in the sperm's midpiece at the base of the sperm head. The sperm tail is a specialized type of cilium aka flagella. Registration is free, and takes less than a minute.