Writing at Overcoming Bias, Robin Hanson refers to a study of beliefs held by twins raised apart, published in 2001 in the Journal of Personality and Social Psychology. The study seems to show that:

Your differing attitudes on abortion, birth control, immigrants, gender roles, and race are mostly due to your genes, while your attitudes toward education, capitalism and punishment are due to your life experiences.”

Hanson’s point is that you might want to rethink beliefs that you have, literally, inherited. My point is: WTF?

If you have a subscription or a library, get oriented with Frank Sulloway’s review of Nancy Segal’s Indivisible By Two:  Lives of Extraordinary Twins in the New York Review of Books.