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Why are people left- or righthanded?

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Anonymous

15y ago
Updated: 8/18/2019

There isn't an exact answer to this question because most doctors and researchers don't know.

However, I came across an interesting theory on a "Miracle of Life" documentary on the Discovery channel.

Basically, it explored the idea that people who are left handed actually started out their gestational life (in the womb) as a twin. When the egg divided, one embryo got the left handed gene while the other got the right handed. If you were not born with a twin, then your twin was reabsorbed into the womb and wouldn't have shown up in any ultrasounds.

This should not suggest that every left handed person started out as a twin, but there has been some research done on this theory.

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Wiki User

15y ago

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