Researchers in Singapore have linked variance in a single gene to political leanings. The gene in question, DRD4, is concerned with the release of dopamine, a neurotransmitter chemical in the brain. And the gene's presence or absence correlated with study participants' leftward focus on inequality or rightward interest in preserving stability.
This link between genes and politics was observed most strongly in women. "The association between political attitude and DRD4 was highly significant for females," researchers noted, and less clear among men.
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