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Unformatted text preview: reproductively isolated from each other. Allopatric speciation occurs when populations of a species become geographically isolated. Allopatric speciation is the most common form of speciation seen today. Parapatric speciation, which is extremely rare, occurs when populations are separated by an extreme change in habitat rather than a physical barrier. However, such processes of speciation are insufficient to explain the diversity of life we see on earth today. Many modern species instead owe their existence to the phenomenon of adaptive radiation, the process by which several new species evolve rapidly through repeated colonization of a new habitat....
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- Winter '09