According to john relethford, Genetic drift increases genetic diversity in larger populations over time is the reason for africa’s high genetic diversity compared to europe and asia.
Genetic drift is the unintentional loss of alleles from a population as a whole. Random fluctuations in allele frequencies simply reduce genetic variation in small populations, resulting in an increased homozygozity and a possible loss of natural evolutionary ability to adapt to change.
However that, when a few individuals and groups are isolated from a larger population, a new population with a gene pool that is not representative of the original population is formed.
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