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Thread: Latin American Calculator

  1. #11
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    Quote Originally Posted by drobbah View Post
    Why would Afro-Brazilians plot next to Europeans or East Med populations.I am talking about black people and those with significant black admixture (more than 15% SSA) not white latinos
    Well, in that case I think people with around 25% SSA would plot with coastal Maghrebis in a global wide PCA, people with around 40-50% near South Moroccans and those with more than 50% and less than 60% with Horners.

    But keep in mind these are ''fake overlaps'' in general, the distances are huge because the actual components are quite different. If you mix a WHG with a Yoruba you probably can plot that guy with an Ethiopian, but his genetic distances to actual Ethiopians will be immense.

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  3. #12
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    Quote Originally Posted by Caius Agrippa View Post
    Well, in that case I think people with around 25% SSA would plot with coastal Maghrebis in a global wide PCA, people with around 40-50% near South Moroccans and those with more than 50% and less than 60% with Horners.

    But keep in mind these are ''fake overlaps'' in general, the distances are huge because the actual components are quite different. If you mix a WHG with a Yoruba you probably can plot that guy with an Ethiopian, but his genetic distances to actual Ethiopians will be immense.
    Spot on. The the worst thing is people taking g25 pca distances seriously particularly for recently or historically admixed people. TvD or to a lesser degree pairwise FsT should be the go to along with examining shared haplotypes but whose actually going to set up PLINK and admix tools to go do that every time

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  5. #13
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    Quote Originally Posted by ThaYamamoto View Post
    Spot on. The the worst thing is people taking g25 pca distances seriously particularly for recently or historically admixed people. TvD or to a lesser degree pairwise FsT should be the go to along with examining shared haplotypes but whose actually going to set up PLINK and admix tools to go do that every time
    I think Davidski himself do not send PCA maps to people he thinks are too admixed when delivering Global 25 results.

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  7. #14
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    Quote Originally Posted by Caius Agrippa View Post
    Well, in that case I think people with around 25% SSA would plot with coastal Maghrebis in a global wide PCA, people with around 40-50% near South Moroccans and those with more than 50% and less than 60% with Horners.

    But keep in mind these are ''fake overlaps'' in general, the distances are huge because the actual components are quite different. If you mix a WHG with a Yoruba you probably can plot that guy with an Ethiopian, but his genetic distances to actual Ethiopians will be immense.
    Are there Afro-Brazilians in the 80-99% SSA range? And I wonder if there are other more pristine Africans in other Latin American countries.

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  9. #15
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    Quote Originally Posted by drobbah View Post
    Are there Afro-Brazilians in the 80-99% SSA range? And I wonder if there are other more pristine Africans in other Latin American countries.
    Brazilian singer Milton Nascimento (you can google all the people I'm talking about here) came out 99% African in a DNA test, actor Lázaro Ramos is 85% African, singer Seu Jorge is 85% African too. In many places of Brazil you can find people of predominantly SSA ancestry, especially in Northeast and Southeast, but even in Southern Brazil those can be found. But overall I think not more than 5% of Brazilians are more than 80% SSA, that's roughly the number of full Europeans as well (but people over 80% European would be more than 30% of the population). I think the average (self-declared) Afro-Brazilian would be 50% SSA, but definitions over who is Afro-Brazilian may vary, if any degree of African counts as afrodescendant then 90% of Brazilians have at least some African ancestry.

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    We can detect the national and regional origin of Latin American samples just like MyHeritage is trying to do. I think every country and region heve specific types of admixtures with different sources in Iberia, Europe, Africa and local Native Americans. In the future it will be easy to find Latin American clusters and their spatial, social and ethnic distributions.
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