Re:The geography of American left-handedness
by MacAsm on Wednesday September 23, 2015 @02:01PM
(#10266751)
my parent are right-handed too but my grandma is leftie. But it seems almost everybody else didn't have any leftie in the family that they're he's aware of. I find this odd, mostly because they says it's genetics so a lot of people cary left handed genes but it's hardly "primary"/"used" (I don't know the right word).
What's interesting about left handedness is that even if both parents are lefties, the kid's chance is only 26%. Which is strangely low for something where there is some generic link.
If one parent is a lefty the chance drops to 19%, and if no parent is a lefty then it is 9%. The average over society is 10% of the population.
I almost don't wonder if generics isn't the primary reason that people are left handed, but generics can make you more likely to be a lefty (for whatever reason). That would somewhat explain the statistics.