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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

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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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Gene Flow02:39

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Types of Selection01:46

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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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Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
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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: Mar 6, 2026

Bacterial Leaf Infiltration Assay for Fine Characterization of Plant Defense Responses using the Arabidopsis thaliana-Pseudomonas syringae Pathosystem
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Frequency-dependent selection in a wild plant-pathogen system.

Pierre Chaboudez1, J J Burdon1

  • 1CSIRO Biological Control Unit, Campus International de Baillarguet, F-34982, Montferrier-sur-Lez, France.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

The rust fungus Puccinia chondrillina primarily infects the most common clones of its host plant, Chondrilla juncea. This pattern suggests the fungus imposes negative frequency-dependent selection on host populations.

Keywords:
AgamospermyChondrilla junceaFrequency-dependent selectionFungal parasitismPuccinia chondrillina

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Area of Science:

  • Plant pathology
  • Evolutionary biology
  • Ecology

Background:

  • Chondrilla juncea, a perennial herb, exhibits clonal reproduction.
  • Puccinia chondrillina is a rust fungus that infects Chondrilla juncea.

Purpose of the Study:

  • To investigate the relationship between host clone frequency and pathogen infection.
  • To determine if Puccinia chondrillina imposes frequency-dependent selection on Chondrilla juncea populations.

Main Methods:

  • Studied 16 Chondrilla juncea populations across eastern Turkey.
  • Identified 48 multilocus isozyme phenotypes (clones) in the host plant.
  • Assessed the incidence of Puccinia chondrillina infection within these clonal populations.

Main Results:

  • 88% of host clones were geographically restricted; 12% occurred in multiple populations.
  • The most common host clone was infected in 13 of 16 populations.
  • In 10 sites, the commonest clone was the only one infected; in 3 sites, the second commonest clone was infected.

Conclusions:

  • A significant association exists between rust incidence and host clone frequency.
  • Puccinia chondrillina likely imposes negative frequency-dependent selection on Chondrilla juncea.
  • This interaction influences the population dynamics and genetic structure of the host plant.