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Well before drawing such conclusions you should also question your sources. This is what the study also says :
https://www.cell.com/current-biology...822(17)31257-5The results reveal that this individual likely was lactose intolerant and had brown eyes, dark hair, and light or medium skin color. These results are similar for the other individuals where SNP information is available, albeit with lower coverage, suggesting that—at least for this sample of Guanches—the dominating phenotype was lactose intolerant, dark hair, light or medium skin color, and brown eyes (Table S4).
that's how they were depicted :
Also some of them being "light" was totally possible because even today you find north africans with such features :
No offense but you really seem to base your opinion on stereotypes and I'm not suprised because Portugal has a very small north african community. Brown skinned/negroid looking north africans are rare and certainly do not form the average. Most of us look more like middle easterners than some kind of negroid admixed population.
Here some pics of my people (coastal north africans) :
Some north africans are indeed descendent of black slaves (they are mostly found in saharan oasis and in big cities) but they are a minority (https://en.wikipedia.org/wiki/Haratin)
I score 5-6% SSA and negligible amount of NE african
Indeed but I was talking about the average phenotype (and to some extant our genetic profile too) and most coastal north africans have the same kind of genetic profile with low variations (this profile is very similar if not identical to ancient north africans). And your "20% ssa" you probably get it from gedmatch but gedmatch has a poor database and is outdated for north africans (I mean seriously analyzing NAs without any TAF sample is ridiculous)
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