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- ...chromosomes including 22 pairs of autosomes and the X and Y sex chromosomes. Sperm cells have 23 chromosomes.
- Sperm cell
- ...chromosomes (either an X or Y sex chromosome and 22 autosomes). The sperm cell has a tail, which helps it swim through the woman's reproductive system to meet an oocyte. The sperm has an oval head...
- ...chromosomes (one X chromosome and 22 autosomes), which are considered immature. At birth, a woman's ovaries contain all the oocytes she will ever have. Each month about 50 oocytes start to grow an...