Well after the first people crossed into America from Asia, were there offshoot tribes that migrated back into Asia ultimately passing their genes to Europe? Could people of European stock have ancestors from North America thousands of years back in time?
by 
Astro17
ANSWERS: 1
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Theoretically yes. On the other hand, the migration could also have only be in one direction: "It is believed that a small human population of at most a few thousand survived the Last Glacial Maximum in Beringia, isolated from its ancestor populations in Asia for at least 5,000 years, before expanding to populate the Americas sometime after 16,500 years ago, as the American glaciers blocking the way southward melted." Source and further information: http://en.wikipedia.org/wiki/Beringia Further information: http://en.wikipedia.org/wiki/Models_of_migration_to_the_New_World#Land_bridge_theory
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