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Sagot :
One way scientists can study human migration pathways is by using DNA pathways.
Genetic markers in mitochondrial DNA: Mitochondrial DNA is maternally inherited. It is less often mutated and hence its sequence can be used to trace kinship among the population. This helps in determining the oldest common ancestor. This can be traced among the population in a specific geographical location.
Scientists, of course, have gained insight into these wanderings because of the fossilized bones or spearheads laboriously uncovered and stored in collections. But ancestral hand-me-downs are often too scant to provide a complete picture of this remote history. In the past 20 years population geneticists have begun to fill in gaps in the paleoanthropological record by fashioning a genetic bread-crumb trail of the earliest migrations by modern humans.
These communities had developed as a result of social networks and social capital exchange. Today, the field recognizes mainly two theories related to social networks: the cumulative causation theory and the social capital theory.
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