DAVID MELTZER: PEOPLING OF THE AMERICAS
Peopling of the Americas as Inferred from Ancient Genomics
1. Professor David Meltzer, an archaeologist, discusses how genomics provides a breakthrough over earlier methods like mitochondrial DNA by using the entire genome to reveal the complex tapestry of ancestry, showing mixing and cross-breeding among populations. Ancestral Native Americans arose from the admixture of Ancient North Siberians and an East Asian population around 26,000 to 24,000 years ago. During the last glacial maximum (23,000–19,000 years ago), lower sea levels exposed the land bridge connecting Siberia and Alaska, and these distinctive ancestral groups became isolated due to harsh glacial cold, positioning themselves to move further south.
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