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Related Concept Videos

Types of Selection01:46

Types of Selection

46.0K
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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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

Gene Flow

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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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Genetic Drift03:33

Genetic Drift

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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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Related Experiment Video

Updated: Mar 10, 2026

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions
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Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Published on: November 6, 2016

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Fisher-Wright model with deterministic seed bank and selection.

Bendix Koopmann1, Johannes Müller2, Aurélien Tellier3

  • 1Center for Mathematics, Technische Universität München, 85748 Garching, Germany.

Theoretical Population Biology
|December 15, 2016
PubMed
Summary
This summary is machine-generated.

Seed banks enhance selection

Keywords:
DiffusionFisher–Wright modelSeed bankSelectionSite-frequency spectrumTimes to fixation

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Area of Science:

  • Population Genetics
  • Plant Ecology
  • Evolutionary Biology

Background:

  • Seed banks are crucial for plant species, storing genetic diversity in soil as dormant seeds.
  • Understanding the interplay between seed banks and selection is vital for plant population dynamics.

Purpose of the Study:

  • To investigate the combined impact of seed banks and selection on genetic diversity in plant populations.
  • To develop a diffusion model that incorporates both selection and a deterministic seed bank.

Main Methods:

  • Utilized a Fisher-Wright model with selection, coupled with a deterministic seed bank model.
  • Derived a general diffusion model by approximating a stochastic delay differential equation.
  • Computed equilibrium site-frequency spectrum and calculated allele fixation times.

Main Results:

  • Seed banks significantly amplify the effect of selection on the site-frequency spectrum.
  • The presence of seed banks increases the time required to reach mutation-selection equilibrium.

Conclusions:

  • Seed banks play a critical role in shaping plant genetic diversity under selection.
  • The findings provide insights into the evolutionary dynamics of plant populations with seed banks.