Based on this genetic evidence, it has also been possible to geographically position the area in north Asia where these early migrants most likely came from. For example, the major Y haplotype present in most American Indians has been traced back to recent ancestors common with Siberians, namely, the Kets and Altaians from the Yenissey River Basin and Altai Mountains, respectively. Going further back, the next common ancestor in the genetic lineage gave rise also to Caucasoid Y chromosomes, probably from the central Eurasian region. The mtDNA evidence argues for a similar conclusion, although it places the homeland of the north Asian first Americans somewhere between contemporary Mongolia and Siberia, most likely around present-day Tibet and Ulan Bator. This is based on evidence indicating that all mtDNA lineages can be found in Siberia except lineage B, which is found in the Ulan Bator region of north Asia.

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No molecular genetic evidence has been found to support theories that argue Pleistocene Europeans, ocean going Polynesians, sea-faring Persians, or other cultural groups migrated to the Americas. In fact, the molecular genetic evidence is fairly conclusive: today's American Indian, Alaskan Native, and First Nation people's ancestors originally migrated to the Americas from north Asia. The exact times when these migrations took place are still under dispute, but the molecular genetic evidence strongly argues for a greater time depth of human occupation in the Americas.