Genes for Morality?

Though no one has identified genes for morality, there is circumstantial evidence they exist. The character traits called "conscientiousness"; and "agreeableness" are far more correlated in identical twins separated at birth (who share their genes but not their environment) than in adoptive siblings raised together (who share their environment but not their genes).

-- Steven Arthur Pinker

from "The Moral Instinct"

Quoted on Wed Jun 22nd, 2011