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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

20.1K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Types of Selection01:46

Types of Selection

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

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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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Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

53.0K
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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Mutations in Microorganisms01:18

Mutations in Microorganisms

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Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...
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Speciation Rates01:07

Speciation Rates

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Overview
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Related Experiment Video

Updated: Apr 28, 2026

Measuring Microbial Mutation Rates with the Fluctuation Assay
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Emergent frequency-dependent selection predicts mutation outcomes in complex ecological communities.

Shing Yan Li1, Zhijie Feng2, Akshit Goyal3

  • 1MIT Center for Theoretical Physics - a Leinweber Institute, Cambridge, MA 02139, USA.

Biorxiv : the Preprint Server for Biology
|April 27, 2026
PubMed
Summary
This summary is machine-generated.

Ecological interactions in diverse communities influence evolution by creating frequency-dependent selection. This phenomenon suppresses beneficial mutations, impacting evolutionary outcomes in eco-evolutionary dynamics.

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Area of Science:

  • Evolutionary Biology
  • Community Ecology
  • Population Genetics

Background:

  • Classical population genetics models often overlook complex ecological interactions within species-rich communities.
  • Understanding how ecological feedbacks shape evolutionary trajectories is crucial for predicting mutation outcomes.

Purpose of the Study:

  • To integrate community ecology principles into population genetics frameworks.
  • To develop a generalized model for predicting evolutionary dynamics in diverse ecosystems.

Main Methods:

  • Dynamical mean-field theory was employed to link community ecology with population genetics.
  • An analytic expression for fixation probability was derived, extending existing formulas.

Main Results:

  • Ecological interactions induce emergent frequency-dependent selection, quantified by ecological feedback strength.
  • Fixation of beneficial mutations is significantly suppressed due to prolonged parent-mutant lineage coexistence.
  • Suppression effects intensify with increased effective population size and available ecological niches.

Conclusions:

  • A novel framework integrating ecological interactions into population genetics was established.
  • Eco-evolutionary dynamics in complex communities can be predicted using simplified models.
  • Frequency-dependent selection acts as a key mechanism altering evolutionary trajectories.