Compared to non-identical twins (or other siblings), identical twins are more likely to be both right-handed or left-handed, however many identical twins have opposing hand preferences.
The likelihood is 2 in 10 if the father uses his left hand. Chances increase to 3 in 10 if the mother uses her left hand. And if both parents are left-handed, there is a 4 in 10 probability that the child will also be left-handed. If the traditional dominant-recessive model were in effect, only left-handed people would have left-handed children.
I'm merely curious about handedness' genetic foundation. While both of my parents are left-handed, my brother and I are right-handed. Both my husband and I are right-handed, and we have two kids—a lefty and a righty. The parents of my husband are also liberals.
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