Is Left-Handedness Genetic?

Evidence suggests that although left-handedness is partly because of genetics, there are other factors that contribute to the condition. Experts have identified a connection between a gene called LRRTM1 and left-handedness; its presence on the father's side of the family might increase the chances of a person being a left-hander. People who have the gene do not automatically become left-handed, however. In fact, research into identical twins has shown that if one is left-handed, there is a 76% chance that the other will be, too.

More about left-handedness:

  • About 10% of the population is left-handed

  • As of 2012, there had been at least six US presidents who were known to be left-handed: Barack Obama, Bill Clinton, George H.W. Bush, Gerald Ford, Harry Truman and Herbert Hoover. In addition, Ronald Reagan and James Garfield were ambidextrous. Earlier US presidents might have been left-handed as well, but there was little mention of handedness for presidents before the 20th century.

  • Machines, furniture and appliances are primarily designed for right-handed people, so left-handers have a higher risk of accidents and injuries. For example, left-handed people are 85% more likely to get into automobile accidents.

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Post 3

Because we are not controlled by our emotions and can compartmentalize issues, giving us the edge to be more pragmatic. That's my theory.

Post 2

Since the beginning of the Twentieth Century there have been twenty Presidents. According to the article, at least six have been left-handed (Ronald Reagan was described as ambidextrous so it is not clear how he started out). That means that thirty percent of the presidents since 1900 have been left-handed -- three times the percentage of the population. That suggests that left-handedness makes someone more likely to become president. I wonder why.

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