by GreekIslandGirl » Sun Jan 20, 2013 12:00 am
Actually, they are a perfect example of genetic diversity within familial relatedness.
If you take the blondest one and the darkest one, lined up, they would not look at all related. But if you throw in the other sisters with the in-between colourations, you can see how blending of characteristics works. So from Africans to Swedes, our two extremes, we have all the colours of the world.
Cue for a coca cola advert ....