Abstract
Genetically conditioned mechanisms which restrict or limit gene exchange between coexisting species or population systems permit the preservation of their genetic integrity, and afford evolutionary independence. In the absence of genetically controlled isolation, coexisting populations would fuse into a single variable population. The fact that biotically sympatric populations which differ in adaptive mode almost invariably maintain their identity is prima facie evidence for their genetic isolation. Genetic isolation is evident in some form in essentially every genus where it has been sought. The degree of isolation need not be a function of genetic divergence or taxonomic distance, although in most instances a positive correlation may be found.
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Levin, D.A. (1978). The Origin of Isolating Mechanisms in Flowering Plants. In: Hecht, M.K., Steere, W.C., Wallace, B. (eds) Evolutionary Biology. Evolutionary Biology, vol 11. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6956-5_4
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