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Though the genes in question have yet to be identified, this result suggests they are too abundant to be there by chance in other words they are being kept in the population by natural selection because psychopathic behaviour confers a selective advantage.
ECONOMIST: Evidence that psychopaths are born, not made
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The human population exploded and without natural selection pressure, fecundity in the types economic activity flourished.
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Selection can shift a population from life in the trees to life on the ground by tiny steps but only if the right kind of variation is available.
ECONOMIST: A master of evolution takes a last long look at Darwin
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Selection on an arboreal ape population will be impotent if variations which improve their terrestrial prospects are sparse.
ECONOMIST: A master of evolution takes a last long look at Darwin
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This creates a selection pressure which drives the genes through the population, as the offspring of wild flies die more often than those of engineered or hybrid flies.
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He said there was no guarantee that introducing a specific genetic change would have much impact in a population which was subject to the effects of many other natural selection processes.
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Natural selection might have been expected to purge them from the population unless they have some compensating benefit.
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According to her account, sex-selection technologies were invented in the West, adopted there as a population-control measure and exported to East Asia by Western aid donors and American military officials.
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Now, paradoxically, the large population that civilisation makes possible means loneliness is commonplace and with it consequences that natural selection, which is blind to the future, has not yet had time to deal with.
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Second, by including the entire eligible Danish population, which is covered by a national tumor registry, the study avoids the problem of selection bias (that is, people who do not make it into your study for various reasons, including refusal).
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