Oogenesis,”1 gamete from each primary oocyteEach meiotic division results in 1 large cell(secondary oocyte in meiosis I and ovum in meiosisII) and 2 small cell (polar body).One or many ova can develop at a time2 layers around ova (zona pellucida andcumulus mass)Most female mammals are born with all the primary oocytes they willever have- About 1 million at birth but degeneration leaves about 200
000 in eachovary at puberty- Ovarian cycle last approximately 28 days in humans- Several oocytes begin maturation but only 1 is ovulated each cycle- Menopause- oocytes become depleted and ovulation stops”