is being left handed genetic?

Question

are there any scientific studies proving it? What does science say is the reason someone is left handed if it isn't genetic?

Answer 1

The theory I'm most familiar with is the one attributes left-handedness to the lack of a gene that causes right-handedness (rather than the presence of a 'left-handed gene'). There are a number of other theories, some involving a combination of genes and some claiming that handedness is also partly influenced by environment.
This site offers a clear enough explanation: http://www.sciam.com/askexpert_question.cfm?articleID=0008F1AD-FE6F-10D2-BE6F83414B7FFE9F&catID=3&chanID=sa005

Answer 2

My brother was left handed and no amount of aversive training changed that. The genes are like a recipe; there is a mixture, not one to one mapping, except for the things of this nature. Then you could think of left-handedness as the cherry on top of the cake recipe.

Answer 3

Scientists observing babies in the womb have observed, whatever thumb the baby is sucking, is the hand the baby will write with later in life out of the womb.
I am 3rd generation leftie and oldest daughter is 4th generation. That means my maternal Grandmother, my mother, myself, daughter. We think we have a 5th generation grandson. He's
3 1/2 and eats and draws and doodles with the left hand.

Answer 4

I would say yes. I have been observed this situation for years. But in some cultures, the left-handed kids are taught to use their right hand instead of left. Therefore, right-handed is more prominent in some cultures.

Answer 5

I am left handed, the only one in my family. My oldest daughter
is left handed and my youngest daughter (almost two years old) show signs of being left handed.

Answer 6

in part, and we don't extremely understand what share everybody is extremely "left exceeded." extremely some it is barely based on the form you be taught as a newborn, that's based lots on which hand your frequently happening "instructor" is.