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Transcript
Spermatogenesis Oogenesis Number of gametes Starts with germinal epithelial cell Starts with germinal epithelial cell Mitosis Mitosis Continuous production. from puberty to old age Maturation of oocytes generated before birth. AND STOPS Constant: sperm cell production has extreme fluctuations in quantity and quality. Continual decrease of the oocytes Exhaustion of the supply at menopause. Meiosis produces Four functioning, small (head 4 m), motile spermatozoids at the end of the meiosis One large, immotile oocyte (diameter 120 m) and three shriveled polar bodies are left at the end of the meiosis Differenciation creates the mature sperm cells Unequal division of cytoplasm in meiosis cause large egg cell & polar bodies. Millions of sperm cells produced. Limited number of cells are produced