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Lecture 20

lecture 20.docx

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James Thomson

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How many genes are involved in reproductive isolation speciation genesSpecies taxonomicmorphologicalbiological concepts Taxonomic isnt used that much Reason is like in humans we dont say that because of looks that we have more than 1 species of us Biological is based on inter fertility exception is asexual 2 modes of speciation founded on geography Both end in similar end stagesallopatricCommon to animals and plantsUses barrier Secondary contact if the barrier is removed and now no longer can reproduce Sympatricprogenitor and derivative are barrier lessTypically there should be gene flow stopping there divergenceRelatively small cases in which it occurs Occurs in plants through polyploidy Stages where reproductive isolation occursFinding mate Mating and fertilization Devel
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