Scientists at the University of California San Diego and Harvard University determined that people who carry a variant of the DRD4 gene are more likely to be liberals as adults, depending on the number of friendships they had during high school. They published their study in a recent issue of The Journal of Politics…

However, social environment was critical. The more friends gene carriers have in high school, the more likely they are to be liberals as adults. The authors write, “Ten friends can move a person with two copies of 7R allele almost halfway from being a conservative to moderate or from being moderate to liberal.”

They theorize a larger social network may bring more diverse viewpoints, which could be an influence on the liberal development.