Unformatted text preview: genetic architecture of speciation. Best data on both of these issues have come from the many species of Drosophila Coyne and Orr (1989, Evolution vol. 43, pg. 362-381) take Ayala's approach one step further and attempt to correlate genetic distance (Nei's D) with amounts of prezygotic and postzygotic isolation. In the literature there are many reports of the amount of genetic distance between closely related species of Drosophila and the amount of reproductive isolation between many of the species for which genetic distance has been measured ( premating or prezygotic isolation is measured as [1-(proportion of heterotypic matings/proportion of homotypic matings)] which ranges from - infinity for all heterotypic (between species) matings to 0 for random mating to +1 for all homotypic matings. Rarely do two species prefer to mate with the wrong type so the index effectively ranges from 0 to 1)....
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This note was uploaded on 11/06/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10