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BIOL2609_L6_2007

BIOL2609_L6_2007 - Molecular Ecology Lecture 6 Sex whats...

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Molecular Ecology Lecture 6 Sex - what’s the point?
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Introduction We have considered how genetic variation responds to evolutionary pressures – Here organisms are ‘genetic systems’ that allow genes to pass on copies of themselves BUT, life is a little more complex – The major feature of genetic systems is whether they are sexual or asexual
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Sex did not evolve for reproduction! It is pointless as a tool for reproduction since it does not increase the number of individuals – Two genomes merge, recombine and then segregate, so …. Sex is actually a method to produce genetically diverse offspring
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Types of sex Most microorganisms reproduce mitotically by binary fission – This is not sex as no recombination occurs – Daughter cells are clones of the parent Sexual reproduction on the other hand requires two parents – Sexual life cycles may be diplontic or haplontic
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