me and my younger bro are left handed. but my parents aren't. the only person from both sides of my family who is left handed is my maternal grandpa. what are the odds of having two kids in a family who are left handed born to non left handed parents???
2007-03-10 11:39:50 · 4 answers · asked by Anonymous in Society & Culture ➔ Other - Society & Culture
No one's sure if left-handedness is genetic, a learned behavior, caused by prenatal or birth trauma, or if it's some combination of these factors.
Studies of families and identical twins prove only an indirect genetic cause for left-handedness. Within families, one study found that if both parents are right-handed or if only the father is left-handed, a child has a 1 in 10 chance of being left-handed. If only the mother is left-handed, the odds rise to 2 in 10. If both parents are left-handed, the child has a 4 in 10 chance of being left-handed. So, while left-handedness might be passed from parent to child, the chances are still greater that a child will be right-handed. Identical twins have identical genes and, if handedness were wholly genetic, both twins would be either right- or left-handed. But in studies of left-handed twins, only 76% of the pairs were both left-handed.
2007-03-10 11:50:21 · answer #1 · answered by Graham T 2 · 0⤊ 0⤋
the chances for any one child is 1/4 so the odds of two kids is 1/16. Unusual but not that rare.
2007-03-10 19:47:46 · answer #2 · answered by Dusie 6 · 0⤊ 0⤋
i'm left handed and i have no clue
2007-03-10 19:49:32 · answer #3 · answered by Anonymous · 0⤊ 0⤋
You may not have met your real father yet...
2007-03-10 19:56:18 · answer #4 · answered by Deathbunny 5 · 0⤊ 1⤋