The mechanisms of reproductive isolation are a collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation. They prevent members of different species from producing offspring, or ensure that any offspring are sterile. These barriers maintain the integrity of a species by reducing gene flow between related species. - Wikiтак уже и умру тупым. ну да и хер с ним.
Ardrey (The Social Contract) пишет про это:
In the human species, language as a rule forms the sharpest barrier between populations, and that is why the line of language forms usually the national boundary, and why, with rare exceptions, political boundaries enclosing varying language groups tend to enclose trouble as well. But even within an interbreeding population of common language, still religion, geography, allegiances of custom or occupation, economic class, even degree of education all tend to reduce to smaller groups any high probability of meeting and mating. And so the smallest unit of truly equivalent chance is known as a deme, or isolate, and Dobzhansky has suggested that among people even today isolates number hundreds, rarely thousands. A study of marriage records in France has revealed the paradox that in the mountains such isolates average about 1,100 while in Paris, where one would expect broad mixture, they are only about 900.900 в Париже, Карл!
вот что Google находит на reproductive isolates господибожемой
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