Angela
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It's a very different picture compared to Argentina/Uruguay or Brazil, or even Venezuela.
See: Daniel N Harris
"Evolutionary Genomic Dynamics of Peruvians Before, During, and After the Inca Empire
https://www.biorxiv.org/content/early/2017/11/16/219808.1
"[FONT="]Native Americans from the Amazon, Andes, and coast regions of South America have a rich cultural heritage, but have been genetically understudied leading to gaps in our knowledge of their genomic architecture and demographic history. Here, we sequenced 150 high-coverage and genotyped 130 genomes from Native American and mestizo populations in Peru. A majority of our samples possess greater than 90% Native American ancestry and demographic modeling reveals, consistent with a rapid peopling model of the Americas, that most of Peru was peopled approximately 12,000 years ago. While the Native American populations possessed distinct ancestral divisions, the mestizo groups were admixtures of multiple Native American communities which occurred before and during the Inca Empire. The mestizo communities also show Spanish introgression only after Peruvian Independence. Thus, we present a detailed model of the evolutionary dynamics which impacted the genomes of modern day Peruvians."
[/FONT]I think there's a bit of an analogy with Europe. The Incas had created a sophisticated, complex, structured society, and their empire, at least in the heartland, was densely populated. There was much less genetic introgression here than in sparsely populated and far more primitive Argentina/Uruguay/Brazil.
See: Daniel N Harris
"Evolutionary Genomic Dynamics of Peruvians Before, During, and After the Inca Empire
https://www.biorxiv.org/content/early/2017/11/16/219808.1
"[FONT="]Native Americans from the Amazon, Andes, and coast regions of South America have a rich cultural heritage, but have been genetically understudied leading to gaps in our knowledge of their genomic architecture and demographic history. Here, we sequenced 150 high-coverage and genotyped 130 genomes from Native American and mestizo populations in Peru. A majority of our samples possess greater than 90% Native American ancestry and demographic modeling reveals, consistent with a rapid peopling model of the Americas, that most of Peru was peopled approximately 12,000 years ago. While the Native American populations possessed distinct ancestral divisions, the mestizo groups were admixtures of multiple Native American communities which occurred before and during the Inca Empire. The mestizo communities also show Spanish introgression only after Peruvian Independence. Thus, we present a detailed model of the evolutionary dynamics which impacted the genomes of modern day Peruvians."
[/FONT]I think there's a bit of an analogy with Europe. The Incas had created a sophisticated, complex, structured society, and their empire, at least in the heartland, was densely populated. There was much less genetic introgression here than in sparsely populated and far more primitive Argentina/Uruguay/Brazil.