ANTH 1102 Lecture Notes - Lecture 6: Abo Blood Group System, Balancing Selection, Melanin
24 Aug 2016
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Case studies of gene flow and genetic drift. Any past migrations, invasions, or contacts between peoples ultimately involves gene flow. Because the history of human populations also involves changes in population size, we must consider genetic drift. Social organization and genetics of south american indians of the rain forest. The small size of the populations and their general isolated nature act to increase the likelihood of genetic drift. As populations grow, the limits on the environment are soon reached; when they become this big, they will often fission into separate groups. The formation of new, smaller villages from old (fission) is expected to lead to increased opportunity for genetic drift. The merging of smaller groups to form large ones (fusion) acts to some extent to counter the effects of genetic drift. All practice exogamy (finding a mate in another group) which results in gene flow between villages.
