Scientists use dna to track the migration of humans across the planet. after a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. therefore, dna samples taken from would have the most unique mutations, representing the most recent population to migrate to a new area.

The Americas

Explanation:

Scientists use DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, DNA samples taken from __the Americas__ would have the most unique mutations, representing the most recent population to migrate to a new area.