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Unformatted text preview: higher values than an index based only on evidence for inviable hybrid offspring. Coyne and Orr extracted these two types of data from the literature and tested some important ideas about the genetics of speciation. The general idea is that genetic distance (D) is positively related to time (the molecular clock hypothesis) and thus species pairs showing different degrees of genetic distance should be at different degrees of completion of the speciation process (be aware that many organisms are in the process of speciating as you read these notes). Coyne and Orr show that there is a significant relationship between genetic distance and both premating and postmating isolation...
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- Fall '10