Genetics

A 2014 study published in Behavioral Genetics looked at 12,000 twins, both identical and fraternal,from 5 countries. It found that political attitudes were 60% determined by environment and 40% determined by genes. (Zaraska, M. The genes of left and right. Scientific American Mind, 2016, 27(3), 9-10) http://www.finebergpsychotherapy.com