News Genetics Genes for body symmetry may also control handedness Lefties and righties can thank same DNA that puts hearts on left side for hand dominance Share this:FacebookTwitterPocketRedditPrintEmail By Tina Hesman Saey September 13, 2013 at 3:42 pm This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe