Says psychologist Oliver James at the Guardian:
Low intelligence and high rates of mental illness are more common in poor people. Geneticists maintain that genes play a major role in causing both. But if they were right there would be an inexorable logic that suggests inferior DNA caused poor people to sink to the bottom of the gene pool.
In the light of the findings of the human genome project, however, that idea is no longer defensible – as the leading psychologist Ken Richardson recently pointed out in the house magazine of the psychology profession. On the contrary, the implication of the unimportance of genes is that if we changed society in the right ways, we could virtually eradicate not only low academic performance and mental illness but also criminality and problems such as substance abuse.
Since the project published its results 16 years ago, genes have been found that have a significant influence on physical traits like height and weight, so you might have expected the same for psychology by now. But Britain’s leading geneticist – Robert Plomin, of King’s College, London – hasn’t found any specific DNA variants that have a significant effect on differences in our psychology.
Scientists call this the missing heritability. But there are strong grounds for supposing the heritability is not actually missing – it’s non-existent.More.
And here we thought epigenetics could somehow be twisted to make poor performance at least somebody else’s fault — preferably that of our distant descendants… wouldn’t get no backchat from them anytime soon. 
James makes a serious argument for nurture as the key ingredient.
See also: There’s a gene for that… or is there?
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