Do you realise that you are implying that sexual selection is in favour of light eyes in general? This was not what I stated. I merely talked about differentia

Do you realise that you are implying that sexual selection is in favour of light eyes in general? This was not what I stated. I merely talked about differentiating in- and out-groups, which is localised, meaning the homogeneity of an eye colour within an ethnicity can be explained through sexual selection. Regarding the prevalence of brown eyes, light eyes and hair are a recent and recessive mutation. That is all that is required to explain why it is localised and less common: it is limited to people who descended from the point of origin of the mutation. In this case that would be Northern Europe. http://learn.genetics.utah.edu/content/basics/patterns/ http://learn.genetics.utah.edu/content/basics/patterns/