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Italy its actually pretty heterogenous, the North is actually more closely related to Provence France or even Iberia than Sicily for example, but Portugal its one of the most homogenous countries in Europe, North and South are almost (if not) genetically identical, the vision that Algarve and Alentejo are "darker" is prob bcs South have a bigger solar incidence and also experiment a Mediterran climate, while North is more elevated and with a more Oceanic influence climate, u can check some results even here in TA, Damiăo for example is a Southern Portuguese member here that is more Northern shifted genetically than Ruderico that was from North if im not wrong, anyway their results in most g25 results that they posted here are pretty much similar.
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