Important question What is the "heterozygosity"?

[Feral]

I'm on a discussion about genetics and its relevance on giving ethnicities their esencial compound of "race".

Understanding that the word "race" denotes a morphological or genetical differential variation from the homogeneity of these among distinct groups (of an subspecies).

Some people had said the heterozygosity among all human populations is so high, that one couldn't speak about races.

I've said this heterozygosity is overgeneralizated, and that it just mean that different individuals from different groups may have common ancestors.

Can someone enlighten me? :P

[Feral]

Bump. :(

[Feral]

:<

[Ivan Kramskoï]

One of the easiest way to understand homozygosity/heterozygosity is the example of eye color.
Eye color depends of many genes to explain its diversity (from violet to red) but one gene which has two versions tells you if you will have light (grey, blue,blue green, grey-green ...) or dark (green-brown,light brown,dark brown, black)
Each parents gives one version of the gene to the future child so there are 3 possibilities knowing that the dark version is dominant to the light one.
-homozygous dominant : 2 dark versions -> dark eyes.
-heterozygous dominant : 1 light and 1 dark versions ->dark eyes but can pass on its light gene to his future children and so can have light eyeded children.Most Europeans dark eyed euro from north and "central" europe are like this
-homozygous recessive: 2 light versions -> light eyes