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(B) The theory of the African origin of modern man is supported by the study of $DNA$ variation,specifically mitochondrial $DNA$ $(mtDNA)$.Populations

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Greater variation in Africa than in Asia

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(B) The theory of the African origin of modern man is supported by the study of $DNA$ variation,specifically mitochondrial $DNA$ $(mtDNA)$.Populations that have inhabited a region for a longer period accumulate more genetic mutations over time due to the accumulation of random changes.Studies have shown that there is greater genetic diversity (variation) in human populations in Africa compared to populations in other parts of the world,including Asia.This higher level of genetic variation in Africa indicates that modern humans have been present in Africa for a longer duration,supporting the 'Out of Africa' hypothesis.

There are two opposing views about the origin of modern man. According to one view,$Homo$ $erectus$ in Asia were the ancestors of modern man. $A$ study of $DNA$ variation,however,suggested an African origin of modern man. What kind of observation on $DNA$ variation could suggest this?

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