b21 - Macroevolution I: Speciation Spring, 2010 Gene flow...

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Macroevolution I: Speciation Spring, 2010
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Gene flow between populations will ____________ genetic variation within a population, and _________ variation between populations. 1. increase/decrease 1. increase/increase 2. decrease/decrease 3. decrease/increase 4. have no effect on/have no effect on
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Outline What is a species? Reproductive barriers How do new species form? Allopatric speciation Sympatric speciation Adaptive radiation Coevolution
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Microevolution Change in the frequencies of genotypes in a population The formation of species Macroevolution Recall…. .
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Meadowlark Human Which one is a species?
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A species is. .. a group of actually or potentially interbreeding natural populations that are reproductively isolated from other such groups -Ernst Mayr 1942
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Problems with definition of species Does not apply to asexual organisms Can not be applied to fossils “potentially interbreeding” is ill-defined, particularly in the case of hybrids
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b21 - Macroevolution I: Speciation Spring, 2010 Gene flow...

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