Why do populations farther from Africa have more deleterious mutations in their genome?
A. Repeated bottlenecks and founder effects made genetic drift more intense more often.
B. Populations farther from Africa have been exposed to more mutagens in the environment.
C. Those populations have experienced more intense natural selection, so more deleterious alleles increased in frequency by genetic hitchhiking.
D. As people migrated over the globe they interbred with Neanderthals and Denisovans.
E. The populations are younger, so purifying selection has not had time to purge deleterious mutations from the populations.
Answer: A. Repeated bottlenecks and founder effects made genetic drift more intense more often.
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