Biology Unit 2 AQA - DNA and Meiosis

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amyyy163
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Meiosis.
What's its purpose?
Does meiosis only happen in females whilst they're in their mother's womb (females are born with all the sex cells they need)? And males, do they continue to undergo meiosis and produce sperm for the rest of their lives?

Does meiosis only happen after reproduction?

Any help would be great thanks in advance
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MeZala
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Meiosis allows gametes to have a variety of genes. Gene variation is important, because it can give a better chance of being adapted to the environment, therefore one can survive for longer and pass down their genes to their offspring.
At the fetal stage oogonia divide by mitosis, it then undergoes a form of meiosis pausing half way through the cycle until ovulation, where meiosis continues to mature the egg. Meiosis then begins at fertilisation.

You will want to read into oogenesis and spermatogenesis.

These links explain it in the correct terminology and much better than I do, please read:
http://www.sparknotes.com/testprep/b...section2.rhtml

http://m.wisegeek.org/what-is-oogenesis.htm

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