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Odds and Ends
New Year 2015-2016
7 1, 9:02am
Isolation is a requirement because large populations keep genetics sufficiently randomized that absent sufficient selective pressure, the randomness of sexual reproduction will insure that there won't be significant changes to the population genotypes.
Also, humans have an extremely low reproduction cycle, which means that it takes a long time to see any significant evolution in a population.
But all that's irrelevant because all you're doing is trying to plaster a thin layer of scientific credibility over your own political opinions.