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Unformatted text preview: A species can be defined as one or more populations of interbreeding organisms that are reproductively isolated in nature from all other organisms. Genetic divergence results when adaptation, drift and mutation act on populations. Barriers to gene flow between populations isolate those populations, ultimately leading to the formation of new and separate species. Allopatric Speciation Populations begin to diverge when gene flow between them is restricted. Geographic isolation is often the first step in allopatric speciation. Other mechanisms may develop that further restrict reproduction between populations: these are the reproductive isolating mechanisms....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10