
Originally Posted by
Philipvs Vallindervs Calicvla
Sorry?
No, identical twins are identical in felhandedness - "mirror twins" occur when the egg splits slightly later, and they mirror in everything, right down to moles and rogue eyebrow hairs/crooked teeth. Nobody actuall knows what causes people to favour one hand over another, one theory is that every left-hander is a surviving twin.
Different process.
If the genetic factors were deterministic, i.e. if it "caused gayness" then you would expect a much higher correlation
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