Scientists use mitochondrial 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.Based on this,mitochondrial DNA samples taken from ____ would have the fewest unique mutations,representing the original and oldest DNA sequences.

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Africa is considered to be the ancestral homeland for modern humans, so mitochondrial DNA samples taken from there would have the fewest unique mutations and represent the original and oldest DNA sequences.

Scientists Use Mitochondrial DNA to Track the Migration of Humans