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Mutation, Gene Flow, and Genetic Drift01:09

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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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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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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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SMALL POPULATION GENETIC VARIABILITY AT LOCI UNDER STABILIZING SELECTION.

Patrick Foley1

  • 1Department of Biological Sciences, California State University, Sacramento, CA, 95819, USA.

Evolution; International Journal of Organic Evolution
|June 2, 2017
PubMed
Summary
This summary is machine-generated.

Genetic variability in finite populations under stabilizing selection shows nearly neutral evolution. Key parameters like population size (N) and selection strength influence genetic diversity, impacting interpretations of molecular evolution and extinction risk.

Keywords:
Conservation geneticsgenetic variationmolecular clocksmall population

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Area of Science:

  • Population Genetics
  • Evolutionary Biology
  • Molecular Evolution

Background:

  • Investigating genetic variability in finite populations is crucial for understanding evolutionary processes.
  • Stabilizing selection, a form of natural selection, maintains optimal trait values and can influence genetic diversity.
  • Previous work suggests genetic variability is influenced by population size and selection, but the interplay under stabilizing selection requires further elucidation.

Purpose of the Study:

  • To analyze genetic variability at loci under stabilizing selection in finite populations.
  • To examine the influence of population size (N), mutation rate, and selection strength on genetic diversity measures.
  • To compare results with neutral theory and assess implications for molecular evolution and extinction vulnerability.

Main Methods:

  • Employed analytical methods to derive theoretical predictions for genetic variability.
  • Utilized computer simulations to corroborate analytical findings and explore complex dynamics.
  • Examined three key measures: number of alleles (k), heterozygosity (H), and additive genetic variance (Vg).

Main Results:

  • A nearly-neutral theory emerged, with a composite parameter S = NVM /Vs prominently influencing outcomes.
  • Equilibrium heterozygosity (H) closely resembles neutral theory but is modulated by an effective mutation rate (μc).
  • Additive genetic variance (Vg) is explained by the derived formula, except in very small populations where extinction is a factor.

Conclusions:

  • Genetic variability under stabilizing selection yields similar equilibrium values to neutral theory, modifying interpretations of genetic distances.
  • Low heterozygosity values are proportional to N, potentially explaining the narrow range observed across species.
  • Nearly neutral evolution is difficult to distinguish from strictly neutral theory using standard tests, and extinction risk is linked to both genetic variation and selection.