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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Chance, Variation and Shared Ancestry: Population Genetics After the Synthesis.

Michel Veuille1

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Journal of the History of Biology
|October 26, 2019
PubMed
Summary
This summary is machine-generated.

Neutral evolution, once overlooked, is now foundational in evolutionary biology. It provides a null model for understanding genetic variation and species history.

Keywords:
Modern synthesisNatural selectionNeutral evolutionPopulation genetics

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Genomics

Background:

  • Historically, natural selection dominated evolutionary thought, overshadowing the concept of neutral change.
  • The neutralist-selectionist debate (1970-1980) significantly increased focus on neutral evolution.
  • Mendelian inheritance provided the first mathematical framework for neutral evolution.

Observation:

  • Neutral evolution offers a contrast to evolution by natural selection, shifting the paradigm from species fixity to continuous change.
  • Neutral change yields testable predictions regarding standing genetic variation.
  • This provides a baseline for identifying other evolutionary mechanisms like natural selection.

Findings:

  • The integration of coalescent theory, DNA sequence variation, and numerical analysis has established neutral evolution as a null model.
  • This approach incorporates historical contingency into population genetics.
  • It expands the concept of population beyond the Modern Synthesis's view of a simple gene pool.

Implications:

  • Neutral evolution is now a cornerstone for evolutionary reasoning and understanding genetic diversity.
  • It serves as a critical reference point for detecting subtler evolutionary forces.
  • This framework redefines population dynamics in the genomic era.