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Area of Science:

  • Evolutionary biology
  • Human genetics
  • Population genetics

Background:

  • Understanding selection pressures on complex human traits is challenging, especially regarding group differences.
  • Current debates focus on genetic basis, fitness consequences, genetic drift, or divergent selection.
  • Existing models often overlook environmental influences on trait evolution.

Purpose of the Study:

  • To propose an alternative model for the evolution of complex traits.
  • To explain rapid genetic evolution at specific loci under consistent trait optima.
  • To highlight the role of shifting environmental effects in trait evolution.

Main Methods:

  • Theoretical modeling of selection pressures on complex traits.
  • Analysis of genetic variation in the face of environmental fluctuations.
  • Distinguishing between genetic and environmental contributions to group differences.

Main Results:

  • Many complex traits may evolve under stabilizing selection with shifting environments.
  • This can lead to rapid evolution at trait-influencing genetic loci.
  • Trait optima can remain constant despite environmental changes.

Conclusions:

  • Shifting environmental effects, not necessarily divergent selection, can drive rapid genetic evolution.
  • This model offers a plausible explanation for complex trait evolution and group differences.
  • It emphasizes the need to consider environmental dynamics when interpreting genetic variation.