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18/10/2017
From different studies of American and English geneticist groups it was possible to determine that there is a dominant gene that allows people to be right-handed or left-handed.
According to research from the eighth week, the embryo becomes a fetus, and the baby already has all internal organs formed, but not fully developed, and begins there, the formation of fingers, hands and legs.
It was detailed that as of week eleven, the limbs are already formed and the baby begins to move them, taking from that moment predilection on one side over the other, sucking a thumb in concrete, the right or left hand or flexing one more leg than the other.
Left-handed
Experts are convinced that genetic factors are behind the predilection for one limb over the other, with nine out of ten right-handed embryos, and only 1% left-handed, and a very small percentage, below 1%, ambidextrous .
The group of American geneticists determined that there is a dominant gene that makes most people right. Meanwhile, researchers from Oxford University discovered in 2007 that the LRRTM1 gene determines that we are left-handed.
