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Mendelian-mutationism: the forgotten evolutionary synthesis.

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Early geneticists embraced Mendelian genetics and mutation theory, not rejecting natural selection. Their work, predating the Modern Synthesis, laid groundwork for evolutionary concepts like allelic selection and Hardy-Weinberg equilibrium.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • History of science

Background:

  • The classical narrative posits early geneticists rejected Darwinism, delaying evolutionary synthesis.
  • This view suggests a conflict between Mendelism and Darwinian gradualism, leading to an 'evolution-by-mutation' phase.

Observation:

  • Analysis of early geneticists (Bateson, de Vries, Morgan, Punnett) and recent scholarship reveals an alternative perspective.
  • Early geneticists integrated discrete inheritance and mutation theory with selection, rejecting specific Darwinian concepts, not selection itself.

Findings:

  • No evidence supports a significant delay in synthesizing Mendelian inheritance, mutation, and selection.
  • Key evolutionary concepts like allelic selection, Hardy-Weinberg equilibrium, and fixation probability were conceptualized before 1918.
  • Early geneticists' views formed a 'Mendelian-Mutationist Synthesis', distinct from the later Modern Synthesis.

Implications:

  • Challenges the traditional historical account of evolutionary biology's development.
  • Suggests contemporary evolutionary thought aligns more closely with early geneticists' broader synthesis.
  • Highlights the importance of re-evaluating historical scientific narratives based on primary sources and nuanced scholarship.