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