Irene F. Starkehaus -
Across the globe, scientists have been working to discover whether people are born politically liberal or conservative. Studies of this nature have occurred in the scientific communities of the US and Europe over the last two decades. The earliest significant breakthrough occurred in 1999 with an experiment dealing with identical twins who were separated at birth and sustained similar political tendencies.
The most recent scientific surveys come from Singapore where 1700 Han Chinese students were studied for a permutation of the DRD4 gene which determines how dopamine is released into the brain. That variation mirrors earlier research done on people of European descent and indicates a genetic link to individualized dogmatic bias.
According to an article written for Phys.org entitled "Can genes make us liberal or conservative?" that gene will play a significant role in the genesis of a person's political disposition particularly in females:
"What they found was a robust link between the presence (or not) of the variant and a split between liberals inclined to decry inequality, on the one hand, and die-hard conservative wary of change, on the other."