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A 2014 study published in Behavior Genetics looked at a sample of over 12,000 twin pairs

from five different countries over the course of four decades.

They found that political attitudes are roughly 40% genetic.

Epidemiologist Peter Hattemi, the lead author of the study, said,

we inherit part of how we process information, how we see the world, and how we perceive threats.

And these are expressed in modern societies as political attitudes.

A different study in 2015 published in the Proceedings of the Royal Society, B,

showed that 62% of highly liberal women carried dopamine receptor genotypes

that have been associated with extraversion and novelty seeking.

Only 37%, so slightly more than half, of women in this study with conservative attitudes,

carried those particular genes.

Molecular geneticist Richard Ebbstein, who's the lead author of that study,

speculated that perhaps high novelty seekers are more willing to entertain the idea of change,

including in the political sphere.

These findings line up with other psychological research that shows how openness to new experience

as a personality trait is predictive of liberal political beliefs,

while trait conscientiousness tends to correlate with being more conservative.

...