Anonymous wrote:Recessive genetics: Two blue eyed parents can only have blue eyed children. (unless their eyes are not really blue, but are grey --that is a dilution of the brown gene) Green eyes are a mix of brown + blue gene. Dilution gene is an aspect of another gene -- make it lighter, and is recessive.
True blondes, who remain blondes in adulthood without a trip to the hairdresser: If both parents are true blondes, all off spring will be blonde. Blonde + recessive dilution gene = white blond hair.
Blonde as kids, brown as adults have dominant brown gene. It is possible to have a double recessive blonde hair child, but (80% against) unlikely if both parents carry the brown gene. Genetics!
Anonymous wrote:To the 9:11 PP - how do genetics come into play for IQ? I've always been curious about this. My IQ was higher than either of my parents' IQs. My husband is in the 140's and I'm in the high 130's; I'm curious about what that means for our daughter.
Anonymous wrote:Anonymous wrote:Anonymous wrote:Anonymous wrote:I have red hair and my parents both have brown. No idea where that came from.
Red hair, like blonde, is recessive. Somewhere in both of your parents' families, there was red hair.
My parents both had red hair and of their seven children, only one (I) had red hair. I married a redhead and we have three redheads - but we could as easily have had none.
Somewhere. None of my aunts, uncles, cousins, grandparents have red hair.
Maybe PP was right about the mailman.
PP here. It could be generations back. My DH's father was a redhead, but his mother had brown hair, and no one in her family had red - and yet, DH and his sister are redheads.
I think you do need it on both sides of the family, somewhere, in order to produce a redhead (which is why red hair is relatively rare).
Anonymous wrote:You have to look at your wider family gene pool. We were both blonde kids. Our siblings were brunette. Our children are half and half.
On the IQ point, IQ is highly heritable.