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Migration Routes and Genetic Groups
2. Professor Meltzer details the migration routes of ancestral Native Americans, explaining that while they crossed the land bridge during maximum glaciation, they were initially trapped in Alaska by two vast continental ice sheets. The "ice free corridor" along the Rockies was not a viable route until around 13,000 years ago, so the likely path was down the Pacific coast, which may have cleared as early as 16,500 years ago. Meltzer introduces the concept of a "genetic ghost," which is evidence in the genomic record of a contributing population for which no physical sample has yet been found.
2. Professor Meltzer details the migration routes of ancestral Native Americans, explaining that while they crossed the land bridge during maximum glaciation, they were initially trapped in Alaska by two vast continental ice sheets. The "ice free corridor" along the Rockies was not a viable route until around 13,000 years ago, so the likely path was down the Pacific coast, which may have cleared as early as 16,500 years ago. Meltzer introduces the concept of a "genetic ghost," which is evidence in the genomic record of a contributing population for which no physical sample has yet been found.
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