The Ancient North Eurasian ancestry that MA-1 represents is a component of the founding layer — the deep base of Native American ancestry that predates all the subsequent movements and diversifications.

Above that base, the specific genetic profiles of different Native American communities reflect thousands of years of separate demographic histories, migration, mixing, and adaptation to diverse environments across two continents.

MA-1 is not a key to any specific modern Native American community’s ancestry in the particular sense.

He is a key to the deep ancestral layer that underlies all Native American ancestry — the Ancient North Eurasian component of the founding mixture that is part of what every Native American population carries, in varying proportions and in combination with other ancestral components.

The Scale Of The Americas