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Maintaining evolvability.

James F Crow1

  • 1Genetics Laboratory, University of Wisconsin, Madison, WI 53706, USA. jfcrow@wisc.edu

Journal of Genetics
|January 17, 2009
PubMed
Summary
This summary is machine-generated.

Populations maintain genetic variability for evolution through environmental changes, mutation, allele frequency dynamics, and selection. This sustained additive variance allows populations to adapt and evolve over long periods.

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Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics

Background:

  • Quantitative trait variability is often attributed to multiple small-effect genes with additive components.
  • Conventional wisdom suggests directional selection depletes additive genetic variance, leading to near-zero variance at equilibrium, especially for fitness traits.

Purpose of the Study:

  • To explain the persistence of substantial additive genetic variance in populations despite long-term directional selection.
  • To investigate the mechanisms that maintain genetic variability and evolutionary potential in populations.

Main Methods:

  • The study proposes theoretical reasons for the maintenance of additive variance.
  • It discusses the role of environmental fluctuations, mutation, migration, allele frequency dynamics, and selection in maintaining variance.
  • It also considers the impact of genes with large effects and different evolutionary mechanisms.

Main Results:

  • Populations retain significant additive genetic variance due to a dynamic interplay of factors.
  • Environmental changes continually shift selective pressures, preventing fixation.
  • Mutation and migration introduce new genetic variation, while allele frequency dynamics and selection can replenish additive variance.

Conclusions:

  • Sustained additive genetic variance is crucial for the long-term evolutionary capacity of populations.
  • Mechanisms like environmental dynamism and ongoing selection ensure that populations can continue to adapt.
  • Understanding these processes is key to comprehending evolutionary success and the resilience of species.