Final answer:
Genetic diversity is highest in African populations, suggesting a longer established genetic lineage.
Step-by-step explanation:
Genetic diversity is highest in African populations, which suggests that African populations have the most variation in their genetic makeup compared to populations in other parts of the world.
This can be explained by the fact that humans most likely descended from Africa and that genetic variance in Africa is also found in the rest of the world. Studies have shown that all human genomes tested outside of Africa have close ties to the genomes of people in Africa.
Furthermore, the longer ago two populations share a common ancestor, the more time there is for mutations to occur and for adaptations and changes to take place, resulting in greater genetic diversity. Therefore, the high genetic diversity in African populations suggests a longer established genetic lineage.