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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,...
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 Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...
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...

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Genetic demixing and evolution in linear stepping stone models.

K S Korolev1, Mikkel Avlund, Oskar Hallatschek

  • 1Department of Physics and FAS Center for Systems Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Reviews of Modern Physics
|November 13, 2010
PubMed
Summary
This summary is machine-generated.

Population genetics models reveal that spatial structure, like in a one-dimensional continuous population, slows genetic drift and selection. This segregation impacts fixation times and allele frequency variance, with implications for evolutionary dynamics and genetic diversity patterns.

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Area of Science:

  • Population Genetics
  • Evolutionary Dynamics
  • Statistical Mechanics

Background:

  • Reviews mutation, selection, genetic drift, and migration in one-dimensional continuous populations.
  • Connects the stepping stone model to voter models and microbial range expansions.
  • Highlights the tendency for populations to segregate into monoallelic domains.

Purpose of the Study:

  • Extend and review evolutionary forces in a one-dimensional continuous population model.
  • Investigate the impact of spatial segregation on evolutionary dynamics.
  • Analyze fixation times, allele frequency variance, and selective sweeps.

Main Methods:

  • Utilizes a continuous limit of the stepping stone model, leading to a stochastic Fisher-Kolmogorov-Petrovsky-Piscounov equation.
  • Analyzes evolutionary forces (mutation, selection, drift) in segregated populations.
  • Compares one-dimensional models with well-mixed (zero-dimensional) models and validates with simulations.

Main Results:

  • Spatial segregation slows genetic drift and selection by confining them to domain boundaries.
  • Fixation occurs algebraically, not exponentially, in one-dimensional models compared to well-mixed models.
  • Selective sweeps are exponentially fast but with different time constants in one-dimensional versus well-mixed populations.

Conclusions:

  • Spatial structure significantly alters evolutionary dynamics, affecting fixation probabilities and timescales.
  • Segregation impacts evolutionary forces differently, with mutation effects less affected than drift and selection.
  • Findings provide a framework for statistical inference from genetic diversity patterns and can be tested experimentally.