Rare genetic variants trace the signature of left-handed people. This is suggested by the study published in the journal Nature Communications and led by the Max Planck Institute for Psycholinguistics in Nijmegen, the Netherlands.
Only about 10% of people are left- handed and this occurs when the dominant cerebral hemisphere is the right one. Brain asymmetries that lead to the dominance of one hand over the other develop very early in life and this would indicate a probable genetic involvement. The probability that the preferential use of the left hand is hereditary was found to be very low.