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Demic expansions and human evolution

L L Cavalli-Sforza1, P Menozzi, A Piazza

  • 1Genetics Department, Stanford University, CA 94305.

Science (New York, N.Y.)
|January 29, 1993
PubMed
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Human geographic expansions, driven by innovations, shaped global genetic diversity. Early low population densities amplified genetic drift, creating major differences between groups, traces of which remain today.

Area of Science:

  • Anthropology
  • Genetics
  • Human Evolution

Background:

  • Human populations underwent rapid geographic expansion over the last 100,000 years.
  • Low population densities during the Paleolithic era enhanced the effects of random genetic drift.
  • Significant genetic variations among contemporary human groups likely emerged during this period.

Purpose of the Study:

  • To investigate the impact of geographic expansions on human genetic geography.
  • To understand the role of innovations in population growth and movement.
  • To analyze the influence of population density and genetic drift on human genetic differentiation.

Main Methods:

  • Analysis of genetic patterns in relation to historical human population movements.
  • Reconstruction of past population densities and their effect on genetic drift.

Related Experiment Videos

  • Identification of genetic markers reflecting ancient expansions and subsequent population dynamics.

    • Main Results:

    • Successful innovations, both biological and cultural, drove geographic expansions and local population growth.
    • Major genetic differences between human groups evolved during the Paleolithic due to effective genetic drift.
    • Subsequent population growth, particularly with agriculture, reduced genetic drift and differentiation.

    Conclusions:

    • Geographic expansions are a primary driver of human genetic geography.
    • Early human population dynamics significantly influenced current genetic diversity.
    • Genetic traces of past expansions and population changes are still observable.