Another left handed question. My sister and I are both left handed,?

Question

Given that neither of our parents are left handed (and they are our biological parents), and that left handedness is more common in males, what are the odds of this happening?

Answer 1

I'm not sure but my aunt had twins- she is left handed and so is her son
My cousin is left handed and had twins
I have twins but neither is left handed

So twins and left handedness runs in my family

Answer 2

As it is a recessive trait (left-handedness) and both parents must contribute that recessive to have a left-handed child (and I am the only left-handed person from my grandparent's generation to my own children) -- that chance that my parents would have a lefty is 25%.

Answer 3

The hand you write with is determined my your genetics. I believe if i remember correctly from bio class that left handedness is a recessive trait, which means both your parents must have trait. The chance is 25% that a child of theirs would be left handed. (You can calculate the % using a simple punnett square)

Answer 4

My sister and I are both left handed though we are the only living relatives that are lefthanded as far back as we can find.

It is just an oddity that is granted to the gifted!

Answer 5

my little sisters is the only one in my family that is left handed maybe you are left handed because of genetics maybe you or you're sister had a twin some doctors say that if you're left handed you had a twin but it disintegrated in the womb

Answer 6

I don't know the statistics. Three males in my family are lefties. I didn't know that left lateral dominance is more prevalent in males.

Answer 7

Are you sure you're not just adopted sisters? Maybe you should have a little talk with your P's.

Answer 8

that's not uncommon to me. my sister and my youngest brother (third and fourth children, respectively) are both left-handed while me and my brother (first and second, respectively) are right-handed.