anti-social behavior, genes, and environment
New Scientist reports on
a new study that's found "the first clear link between anti-social behaviour and a specific interaction of genes and environment":
The study of 1037 males in New Zealand, now aged about 30, revealed that the low-activity form of the gene alone is not linked to antisocial behaviour. But those who had the gene variation and who had experienced moderate or severe mistreatment as children were much more likely to commit crimes. That group made up only 12 per cent of the study group but were responsible for 44 per cent of offences.