halfalp
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Just to put things in perspective, one of the 30'000 years old Kostenki had some genes for Red Hairs, as one woman from Iberomaurusian. The difference in time frame and in geography is pretty huge, and they probably had a common denominator. If we apply the same for Blue Eyes, it's pretty likely that Blue Eyed individuals were already leaving in all Western Eurasia in the Neolithic times and that they lost it at different place because of natural selection. Now, one thing to take in mind is, why is Blue Eyes positively selected in Cold Countries ( over the 45° parallel north ) and negatively South of it. The only explication is that, North, the populations might have more % of it to be positively selected but south ( the Levante ) constent melting with other populations without the genes, make it really recessive. This make more sense than positively selected because of climate variations. So taking that, we might assume that Blue Eyed people were more common north of the 45° parallel than south of it.