Gametogenesis
Oogenesis and Spermatogenesis
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Spermatogenesis
The process occurs in the male reproductive organ the testes
particularly in the seminiferous tubule. A diploid
spermatogonial stem cell divide by mitosis to form
spermatogonium that divides mitoticaly to form a primary
spermatocyte. The diploid primary spermatocyte divides by
meiosis to form 2 haploid secondary spermatocytes. This is
known as the first meiotic division . The secondary
spermstocytes further undergo meiosis to form 2 early
spematids. This is known as the second meiotic division. The
spematids then differentiate and undergo shape change to
form sperm cells.
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Oogenesis
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Continued......
The process occurs in the female reproductive organ which are
the ovaries. The primary oocyte within the follicle in an
ovary matures. It then divides by meiosis to form 1 haploid
polar body and one secondary oocyte. This is known as the
first meiotic division. In the second meiotic division the
secondary oocyte divides to form one mature ovum and 1
polar body. The polar body from the first meiotic division
divide to form 2 polar bodies. At the end of Oogenesis 3
polar bodies and 1 ovum is formed.
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