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Related Concept Videos

Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Related Experiment Video

Updated: May 21, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Emergence of stable polymorphisms driven by evolutionary games between mutants.

Weini Huang1, Bernhard Haubold, Christoph Hauert

  • 1Evolutionary Theory Group, Max-Planck-Institute for Evolutionary Biology, August-Thienemann-Straße 2, 24306 Plön, Germany.

Nature Communications
|June 28, 2012
PubMed
Summary

This study introduces a new model for polymorphism emergence in haploid populations. It shows that frequency-dependent selection, driven by evolving games, generates higher diversity than neutral or frequency-independent models.

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Mutagenesis and Functional Selection Protocols for Directed Evolution of Proteins in E. coli
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Published on: March 16, 2011

Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Theoretical Ecology

Background:

  • Polymorphisms are typically maintained by mutation-drift balance (neutrality) or specific selective mechanisms like sexual selection or heterozygote advantage.
  • Existing models often assume frequency-independent selection or focus on diploid individuals.
  • The maintenance of diversity in haploid populations under selection remains an area requiring further exploration.

Purpose of the Study:

  • To investigate the emergence of polymorphisms in a population of interacting haploid individuals.
  • To model how evolving games, where mutations alter payoff matrices, influence genetic diversity.
  • To compare the diversity generated by this frequency-dependent selection model against established neutral and frequency-independent models.

Main Methods:

  • Developed a theoretical model where each mutation introduces a new type, expanding the evolutionary game's payoff matrix.
  • This process inherently creates frequency-dependent fitness for new mutations.
  • Analyzed the model to understand the conditions leading to polymorphism and predict diversity levels.

Main Results:

  • The dynamical process of evolving games naturally leads to the emergence of polymorphisms under selection.
  • This frequency-dependent selection mechanism generates substantially higher genetic diversity compared to neutral or frequency-independent selection models.
  • The framework predicts the coexistence of an arbitrary number of types, with an intermediate average diversity.

Conclusions:

  • Frequency-dependent selection, driven by evolving game structures, is a potent mechanism for generating and maintaining high levels of polymorphism in haploid populations.
  • This model offers a novel explanation for substantial diversity observed in nature, distinct from traditional evolutionary frameworks.
  • The study highlights the importance of considering dynamic, frequency-dependent interactions in evolutionary models.