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10/08/2007: "Genes determine decision-making strategies"
To study genetic influence, the scientists recruited twins and since identical twins share the same genes, but fraternal twins don't, the researchers were able to detect genetic influences by comparing the similarity with which identical and fraternal twins played the game. The findings suggest identical twins are more likely to play with the same strategy than fraternal twins.
[ Nature not nurture. Nurture is important, but nature determines the range in which outcome can occur. Even if that's not polite or unpopular. ]
http://www.sciencedaily.com/upi/index.php?feed=Science&article=UPI-1-20071002-15420000-bc-sweden-geneticbehavior.xml