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People often assume that the more blue eyes and blonde in a population, the more Northern European admixture there is.
This is NOT always true.
1) People from the western half of Crete have more light hair and eyes that most parts of mainland Greece, but they are genetically much less Northern European genetically than any part of mainland Greece.
2) People often assume that people in western Sicily have more 'Norman' genes and are more genetically northern because of their high percentage of blue eyes and blonde.. but like Ashkenazi Jews, these light eyes often come with hooked noses and Armenoid influence..
3) Blue eyes and "Celtic" appearances that could pass in the UK are higher in Galicia and northern Portugal than in most of Iberia, but there are higher North African, West Asian, and SW Asian genes there than in Andalusia, if you look at autosomal DNA.
4) There are higher amounts of blue eyes and blonde hair in the Levant than in neighboring regions, but there is no Northern European genetic influence there to result in people having those eyes.
5) Ashkenazi Jews have a large percentage of blue eyes and even blonde hair, but they have less Northern European genetic influence, than European groups that are on average darker than them!
Why do people automatically attribute blue eyes and blonde hair to Northern European influence, when this is not necessarily the case?
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