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The evolution of dominance.

D Bourguet1

  • 1Station de Recherche de Lutte Biologique, INRA, La Minière, 78285 Guyancourt, France. bourguet@jouy.inra.fr

Heredity
|August 14, 1999
PubMed
Summary
This summary is machine-generated.

Natural selection may shape dominance relationships, contrary to the idea that wild-type allele dominance is purely physiological. Evolution can favor modifiers that enhance dominance, especially with adaptive alleles or balanced polymorphisms.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Molecular Evolution

Background:

  • The evolution of dominance is debated, with Fisher proposing selection for dominance modifiers and Wright suggesting physiological explanations.
  • Wright's view, attributing wild-type allele dominance to metabolic pathways, has largely resolved debates on deleterious mutation recessivity.

Purpose of the Study:

  • To re-evaluate the role of natural selection in shaping dominance relationships.
  • To explore evidence supporting the modification of dominance beyond simple physiological consequences.

Main Methods:

  • Review of theoretical models on dominance evolution.
  • Analysis of empirical experimental data concerning selection for dominance modifiers.

Main Results:

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  • Metabolic pathways, as evolutionary products, may possess inherent stability against mutations.
  • Theoretical and empirical evidence suggests significant selection for dominance modifiers during adaptive allele spread and polymorphism maintenance (overdominance, migration-selection balance).

Conclusions:

  • Dominance relationships are likely molded by natural selection to some extent.
  • Selection for dominance modifiers plays a role in evolutionary dynamics, particularly in specific genetic scenarios.