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Gametogenesis
Spermatogenesis
- occurs throughout adult life
- spermatagonia derived from a long series of mitoses, with 1012 sperm produced in a lifetime. This provides the opportunity for new mutation
- process takes 64 days
Oogenesis
- confined to prenatal development
- women is born with 2.5 million oocytes, but only about 400 mature
- oocytes are held in Prophase I and complete meiosis I at ovulation
- Meiosis II is completed at fertilization
- possibility of meiotic errors, lading to chromosome abnormailities
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