What makes a person right or left handed?

The C gene is less likely to occur within the gene pool, but when it is present, the hand preference of the individual with the C gene is determined randomly. Individuals with the C gene will have a 50 percent chance of being right-handed and a 50 percent chance of being left-handed. read more

It appears to be centered on parts of the spine responsible for transmitting electrical impulses to the hands, arms, legs, and feet, and this asymmetry defines whether a person writes with their right or left hand. read more

What makes humanity’s bias against lefties all the more unfair is that left-handed people are born that way. In fact, scientists have speculated for years that a single gene could control a left-right preference in humans. read more