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Related Concept Videos

Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.In the early 20th century,...
Genetic Drift03:33

Genetic Drift

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.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
Gene Flow02:39

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

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Related Experiment Video

Updated: Jun 9, 2026

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

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Published on: February 3, 2023

Evolution in heterogeneous populations: from migration models to fixation probabilities.

S Vuilleumier1, J Goudet, N Perrin

  • 1Department of Ecology and Evolution, University of Lausanne, CH-1015 Lausanne, Switzerland. severine.vuilleumier@unil.ch

Theoretical Population Biology
|September 10, 2010
PubMed
Summary

Dispersal assumptions in population biology significantly impact gene flow and allele fixation. Explicitly documenting migration model assumptions is crucial for accurate ecological and evolutionary predictions.

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Area of Science:

  • Population Biology
  • Evolutionary Ecology
  • Population Genetics

Background:

  • Dispersal is a fundamental concept across population biology disciplines.
  • Different fields (behavioral ecology, population genetics, metapopulation dynamics, evolutionary modeling) make varied assumptions about migration.
  • These implicit assumptions can influence understanding of gene flow and evolutionary trajectories.

Purpose of the Study:

  • To investigate how different migration model assumptions affect effective gene flow.
  • To determine the impact of these assumptions on the fixation probability of selected alleles.
  • To highlight the importance of explicit and empirically documented migration assumptions.

Main Methods:

  • Utilized simulation studies to model various dispersal scenarios.
  • Compared outcomes under different migration types (e.g., source-sink, resident pre-emption, balanced dispersal).
  • Examined effects of different dispersal patterns (e.g., stepping-stone, island dispersal).

Main Results:

  • Migration type and pattern assumptions significantly alter gene flow and fixation probabilities, especially when demes vary in size or selective pressures.
  • Fragmentation and mutation localization are also sensitive to dispersal characteristics.
  • Fixation probabilities can exhibit non-linear responses to migration rates depending on deme characteristics.

Conclusions:

  • The choice of migration model assumptions has profound consequences for evolutionary and genetic outcomes.
  • Ecological and behavioral assumptions underlying dispersal models must be explicitly stated and empirically validated.
  • Accurate modeling of population dynamics requires careful consideration of dispersal mechanisms.