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Natural Selection and Adaptation01:15

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Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
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Polygenic adaptation after a sudden change in environment.

Laura Katharine Hayward1,2, Guy Sella3,4

  • 1Department of Mathematics, Columbia University, New York, United States.

Elife
|September 26, 2022
PubMed
Summary
This summary is machine-generated.

This study models polygenic adaptation to environmental changes, revealing a two-phase process. Rapid initial shifts are followed by slower, stabilizing selection, impacting allele frequencies and fixation probabilities.

Keywords:
background selectioncomplex traitsevolutionary biologygeneticsgenomicsnonepolygenic adaptationquantitative traitsselective sweepsstabilizing selection

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Area of Science:

  • Evolutionary genetics
  • Quantitative genetics
  • Population genetics

Background:

  • Polygenic adaptation, the process by which populations evolve complex traits influenced by many genes, is widespread but not well understood.
  • Understanding polygenic adaptation is crucial for explaining evolutionary responses to environmental change.

Purpose of the Study:

  • To analytically model the dynamics of polygenic adaptation following a sudden shift in the fitness optimum.
  • To characterize the temporal phases of allele frequency changes and fixation probabilities at loci contributing to a quantitative trait.

Main Methods:

  • Analytical modeling of a quantitative trait under directional and stabilizing selection.
  • Characterization of allele dynamics at multiple loci contributing to phenotypic variance.

Main Results:

  • Phenotypic change over time depends on the effect sizes of contributing loci.
  • Identified two distinct phases in allele dynamics: a rapid directional selection phase and a slower stabilizing selection phase.
  • Allele frequency differences and fixation probabilities are influenced by selection direction and magnitude.

Conclusions:

  • The study provides a theoretical framework for understanding polygenic adaptation.
  • Findings have implications for identifying the genetic basis of adaptation in natural populations and humans.
  • The two-phase model offers insights into the tempo and mode of evolutionary genetic change.