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Detecting genetic drift versus selection in human evolution.

Rebecca Rogers Ackermann1, James M Cheverud

  • 1Department of Archaeology, University of Cape Town, Private Bag, Rondebosch 7701, South Africa. becky@science.uct.ac.za

Proceedings of the National Academy of Sciences of the United States of America
|December 18, 2004
PubMed
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Random evolutionary processes, or genetic drift, primarily explain facial diversity in early Homo fossils. While natural selection influenced australopiths, drift dominated early Homo evolution, shaping cranial morphology.

Area of Science:

  • Paleoanthropology
  • Evolutionary Biology
  • Human Origins

Background:

  • Recent paleoanthropological finds highlight significant morphological diversity in the human fossil record.
  • This diversity is often attributed to divergent evolutionary forces acting on ancestral hominin lineages.

Purpose of the Study:

  • To test if random evolutionary processes (genetic drift) can account for morphological diversity in Plio-Pleistocene australopith and early Homo crania.
  • To differentiate the roles of natural selection versus genetic drift in shaping hominin facial morphology during critical evolutionary periods.

Main Methods:

  • Application of quantitative evolutionary theory to analyze fossil cranial morphology.
  • Comparative analysis of morphological diversity patterns between australopiths and early Homo.

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Main Results:

  • Natural selection may have been a significant factor in australopith facial diversification during the late Pliocene.
  • Genetic drift, not selection, appears to be the primary driver of facial morphological diversity in the early evolution of the genus Homo.
  • Quantitative analysis supports genetic drift as the dominant force in early Homo cranial diversification.

Conclusions:

  • The evolutionary mechanisms driving morphological diversification differed between australopiths and early Homo.
  • Genetic drift played a crucial role in shaping the facial morphology of the earliest members of the genus Homo.
  • Understanding these distinct evolutionary forces is key to interpreting the human fossil record.