Introduction•We have considered how geneticvariation responds to evolutionarypressures– Here organisms are ‘genetic systems’ thatallow genes to pass on copies ofthemselves•BUT, life is a little more complex– The major feature of genetic systems iswhether they are sexual or asexual
Sex did not evolve forreproduction!•It is pointless as a tool for reproduction sinceit does not increase the number of individuals– Two genomes merge, recombine and thensegregate, so ….•Sex is actually a method to producegenetically diverse offspring
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Types of sex•Most microorganisms reproducemitotically by binary fission– This is not sex as no recombination occurs– Daughter cells are clones of the parent•Sexual reproduction on the other handrequires two parents– Sexual life cycles may be diplontic orhaplontic