Cientistas compararam o DNA dos nativos americanos com o de cada grupo asiático

For decades, the prevailing theory was simple: Native American ancestors crossed a land bridge from Siberia to Alaska and spread south across two continents. But when geneticists conducted the most comprehensive DNA comparison ever undertaken—testing Native American genomes against populations from across the Asian continent—something extraordinary happened. Only one region matched sufficiently to be significant. And it wasn't where anyone expected.