Studies with autosomal biparental markers reveal very elevated levels of genetic admixture between the three ancestral roots. However, it is also evident that there was an important population effect of the program of “whitening” of Brazil promoted through the immigration of circa six million Europeans in the roughly 100-year period after 1872. This manifests itself both in a predominant (>70%) European genomic ancestry in Brazilian Whites regardless of geographical region and in a high average European genomic ancestry (37.1%) in Brazilian Blacks.
DNA tests probe the genomic ancestry of Brazilians
"White" Brazilians average ~70-80% European ancestry depending on the region (full text).
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