Genes for body symmetry may also control handedness

Lefties and righties can thank same DNA that puts hearts on left side for hand dominance

By Tina Hesman Saey, 15:51 PM September 13, 2013

Left- or right-handedness may be determined by the genes that position people’s internal organs.

About 10 percent of people prefer using their left hand. That ratio is found in every population in the world and scientists have long suspected that genetics controls hand preference. But finding the genes has been no simple task, says Chris McManus, a neuropsychologist at University College London who studies handedness but was not involved in the new research.

“There’s no single gene for the dir...

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