Is being left or right handed genetic?!


Question:

Is being left or right handed genetic?

If you are left handed, are your parents or grandparents also?


Answers:

simple Mendelian genetics...right-handed is the dominant allele (R), left-handed is recessive (r). you can figure it out using a Punnett sqaure.

RR, Rr = RH kid
rr = LH kid

RR + RR = 100% RR -> all RH kids
RR + Rr = 50% RR, 50% Rr -> all RH kids
Rr + Rr = 25% RR, 50% Rr, 25% rr -> 75% RH kids, 25% LH kids
rr + rr = 100% rr -> all LH kids

to be LH, you have to have left-handedness somwhere in the family. however, you can be LH and neither your parents or grandparents would have to be.




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