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And this is where things get confusing . To take only a single , potentially revisionary instance , Grove shows how , in south-west India , Portuguese and Dutch physicians assimilated local practices and knowledge and transformed the European materia medica . The Hardy-Weinberg Principle applies where a natural population is not affected by selective pressures or migration into or out of the area , and where the traits to be studied are determined by dominant and recessive genes . And this is where things fell apart . That is why conservative propaganda was so effective - it told people something they wanted to hear .