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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