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Unformatted text preview: prevents organisms of two different populations from exchanging gametes. Reproductive Isolation: the failure of organisms of one population to breed successfully with members of another; may be due to premating or postmating isolation mechanisms. Speciation: the process of species formation, in which a single species splits into two or more species. Species: the basic unit of taxonomic classification, consisting of a population or series of populations of closely related and similar organisms, a species can be defined as a population or series of populations of organisms that interbreed freely with one another under natural conditions but that do not interbreed with members of other species. Biology 1421 Chapter 16 Key Terms Sympatric Speciation: speciation that occurs in populations that are not physically divided ; normally due to ecological isolation or chromosomal aberrations (such as polyploidy)....
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- Spring '08