Is left-handedness hereditary?

Answer 1

In a manner of speaking, yes, though it appears to me to be possible developmental. It is a complex cognitive process and is predicated on large differences in brain structure. So, most of these answerer's do not know what they are talking about. If your left handed, do not worry, as education is greatly diminishing bias against left handed people. Do not expect to see too many left handed items, though, as left handed people are out numbered ten to one. My brother was left handed and he did all right for himself.

Answer 2

All the answers above are wrong. The real answer is rather interesting. Righthanded ness is dominant. Let’s call the right-handed allele R. If you are RR or Rr, then you are right-handed. If you are rr, however, you have a 50% chance of being left-handed and a 50% chance of being right-handed (its’s a matter of eeny-meeny-miney-mo).

Consider heylisten’s pedigree: Both her Dad’s parents are left-handed, so that means her Dad is rr (but is right-handed). In order for her to be left-handed, her Mom has to at least be Rr which is quite possible (her mom’s parents could have been Rr or rr).

Tattihe’s Pedigree: her parents are probably both rr righthanders. Thus, their children should be about 50% right-handed and 50% left-handed.

I’ll let you ponder lukuluku and Cinnamon girl’s respective pedigrees. They are consistent with Mendelian genetics…There’s not a bastard in the lot.

Answer 3

well not all the time
i am left handed
and most of my family is right handed the only ones are me and my cousin josh and his brother Michael
none of the older people are , but i saw on this show called in the womb / multiples
and is said at most cases left handed people would've had a mirror twin , which mean they would've had a twin who was right handed, but what might have happened to the other one is that they could have disappeared

Answer 4

I was wondering the same thing; it seems weird because my oldest brother was left handed while the three younger siblings were right handed. Now, MY oldest son is left handed while the two younger brothers are right handed!

Answer 5

This is a real thing it depends on if u learn mostly with your left or right side of ur brain i swear there is such a thing as being left or right brained

Answer 6

Nope, my mother and father were right handed.
My youngest sister and I are left handed, and my other two sisters, and other two brothers are right handed.
And it is naff all to do with upbringing or the environment, it is how you brain is wired at birth, lefties use the right side of the brain, and righties use the left side of the brain!

Answer 7

I don't think so but you cannot determine this by saying that it is not because parents are right-handed. Maybe it is due to a multiple gene associations that do not follow Mendels's laws.

Answer 8

i think the hand people write with are the ones w/ the thumb they sucked in the womb.... i saw it on national geographic... but i'm not a genetics pro... you should ask your teacher.. if u dont have one go to the library.

Answer 9

I'm pretty sure it isn't. My two cousins are both left handed but both parents are right handed.

Answer 10

I understand it is not. I am left handed and both of my dad's parents are. My parents are both right handed. Both of my mom's parents are right handed.