Dominant hands?

Question

what's the physiological reason why most people are left or right hand dominant? I know it has something to do with being connected to one half of the brain, but what is the connection? Is there some evolutionary purpose? Do other apes have dominant hands? Why are there more right hand dominant people than left? why can't we all just be ambidextrous?

Answer 1

well right handedness is dominant and left handed is rececive. You need to rececive alleles of left handedness in a chromosome to be left handed. Ambidextrous is rare because you would have to have one allele dominant allele for right and one for left (which would be a mutation i guess) and then that would make it incomplete dominance (character trait that is inbetween when both alleles are dominant)

for example red +white+pink

Answer 2

because thats the way it is.

Answer 3

Handedness does not follow the basic dominant/recessive model and it is thought the environment plays a key role in determining a person's handedness.

http://www.thetech.org/genetics/ask.php?...

I have also read that there is a gene for right handedness but none for left handedness.   So some people are right-handed genetically while others develop right-handedness because it is a right-handed world.  Others develop left-handedness by chance.  (sorry, I'll try to find a reference for you).

You may find this interesting:

http://www.indiana.edu/~primate/brain.ht...