7 - Speciation & hybridization Review of evolution...

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Modes of speciation Isolating mechanisms Allopatric speciation Parapatric speciation Sympatric speciation Hybridization Species radiations
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Agent of  evolution Produces  adaptations ? Effect on  changing  frequencies Effect on  genetic  variation REVIEW:   Agents of evolution & genetic variation
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Speciation:   what is a species? From DeQueiroz (2007)  Systematic Biology  56: 879-886 BIOLOGICAL ECOLOGICAL EVOLUTIONARY COHESIO N PHYLOGENETIC PHENETIC GENOTYPIC
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Speciation:   what is a species? Biological species concept species = population or group of populations that actually or  potentially interbreed, and which are reproductively isolated  from other such groups
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Speciation:   what is a species? Biological species concept Reproductive isolating mechanisms (or barriers) prezygotic postzygotic BARRIERS to interbreeding make populations or species independent  in terms of the evolutionary path that each group will take
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7 - Speciation & hybridization Review of evolution...

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