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Gamete Formation Definition?

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Gamete Formation Definition?

Postby jellyksong » Fri Apr 22, 2011 6:02 pm

In gamete formation, it's defined as (let's say spermatogenesis) "one spermatogonium cell forms a total of 4 sperm".
However, also following the definition of spermatogenesis:
spermatogonium -->(mitosis) 2 primary spermatocytes
2 primary spermatocytes -->(meiosis I) 4 secondary spermatocytes
4 secondary spermatocytes --> (meiosis II) 8 spermatids
development.... --> 8 sperm

I'm confused at this inconsistency. Technically, if one spermatogonium undergoes mitosis to form 2 primary spermatocytes, then the definition should actually be "one primary spermatocyte forms a total 4 sperm".

The diagrams in my Barron's AP book show a spermatogonium undergoing mitosis to form only ONE (as opposed to two) primary spermatocytes, which makes no sense, but does give 4 sperm as the result.

Anyone care to explain this to me?
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Postby Babybel56 » Sat Apr 23, 2011 7:01 pm

Spermatogonium are a germ cell line - so they are constantly undergoing MITOSIS to replace themselves whilst letting certain numbers of their members to differentiate into primary spermatocytes.

These primary spermatocytes undergo MEIOSIS to form a pair of secondary spermatocytes, and these undergo meiosis II to form a quadruplet of spermatids.

So technically each spermatogonium can form an infinite number of spermatids.
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