Question at position 15 Genetic diversity amongst human populations is best explained by __________.racial categorizespopulation sizeethnicitygeographic distancecultural differencesClear my selection

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Question: Genetic diversity amongst human populations is best explained by __________.
Options: racial categorizes, population size, ethnicity, geographic distance, cultural differences

Option 1: racial categorizes. Framing diversity as fixed racial categories is misleading because race is a social construct with limited biological basis, and it does not capture the gradual genetic variation that exists across populations. This option promotes oversimplified typologies rather than explaining patterns of genetic differences.

Option 2: population size. While population size can influence genetic drift and inbreeding within a group, it does not by itself account for the global pattern of how diversity changes with distance between populations. Small populations may show stronger drift, but broad geographic patterns require considering how populations mix and migrate over space.

Option 3: ethnicity. Ethnicity reflects cultural, linguistic, or social identities rather than intrinsic genetic structure. Although some genetic differences align with ancestral origins, ethnicity in itself is not a direct explanation for the geographic patterning of genetic diversity across humans.

Option 4: geographic distance. This option correctly reflects the principal idea of isolation by distance: as populations are physically farther apart, gene flow decreases, and genetic differences accumulate more due to limited exchange and historical migrations. This pattern is well-supported by population genetics data and explains broad geographic structuring of human genetic variation.

Option 5: cultural differences. Cultural practices can influence certain reproductive patterns locally but do not generally explain the gradient of genetic diversity across wide geographic expanses. Culture operates on a different axis from the biological processes that shape genetic variation over space.

Summary: Among the choices, geographic distance best accounts for the observed pattern that genetic diversity among human populations tends to increase with geographic separation, driven by reduced gene flow and isolation by distance. The other options mix social constructs or demographic factors that do not independently explain the spatial structuring of human genetic variation.

Question at position 15 Genetic diversity amongst human populations is best explained by __________.racial categorizespopulation sizeethnicitygeographic distancecultural differencesClear my selection

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