Scientific context: All humans share >99.9% of their DNA. Genetic differences between geographic populations are far smaller than differences between individuals within any population. "Selection" describes reproductive success in a specific environment — not superiority. Variants that are advantageous in one environment may be neutral or harmful in another. ASHG Statement on Genetics and Race (2018)
A genetic variant emerges in one geographic region and may spread via gene flow between neighboring populations. This models how human migration and admixture distribute genetic variation — not how populations "replace" each other. All populations shown are part of one continuous human species with constant gene flow throughout history.
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These simulations model simplified population genetics for educational purposes. Real human populations are not discrete units — gene flow is continuous. Geographic frequency differences reflect migration history and environmental adaptation, not biological hierarchies. ASHG 2018
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