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Speciation160-page1 - Methods of Speciation 1 We have been...

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Methods of Speciation - 1 We have been discussing changes that occur in populations through time using the mechanisms of evolution. Speciation results when populations diverge to the point of reproductive incompatibility. Reproductive isolation is a by-product of genetic change. It does not drive genetic change. Recall the definition of species: A species is one or more populations whose members interbreed under natural conditions, produce fertile offspring, and are reproductively isolated (can not interbreed) with other populations. Non-sexually reproducing organisms and fossils cannot be given species names objectively using this definition. Nonetheless, it's a good working foundation. Some molecular systematic biologists are proposing a revised species definition that would incorporate the ability to diagnose descent from a single ancestor. This is a phylogenetic definition, based on genetic relationships and DNA homologies. Such a definition works with organisms
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