In oogenesis, or the female form of
gametogenesis, mature egg cells are
produced that may be later fertilized. Mammals,
including humans, undergo mitosis to form the
diploid primary oocyte. The oocyte divides
into a haploid secondary oocyte and a polar body
by meiosis I. The polar body contains
genetic material discarded by the cell and
degrades. The secondary oocyte undergoes
meiosis II to form a haploid ovum that
matures into an egg cell and a second polar body.
The second polar body degrades. Each germ cell
produces only one mature egg cell. This process is
similar in humans and mammals, but varies across
all other species.
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