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Selection response in traits with maternal inheritance.

R Lande1, M Kirkpatrick

  • 1Department of Ecology and Evolution, University of Chicago, IL 60637.

Genetical Research
|June 1, 1990
PubMed
Summary
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Maternal inheritance, the transmission of traits from mothers, significantly alters evolutionary dynamics compared to Mendelian inheritance. Understanding these complex maternal effects is crucial for predicting evolutionary trajectories and improving domesticated species.

Area of Science:

  • Evolutionary Biology
  • Genetics
  • Quantitative Genetics

Background:

  • Maternal inheritance, a non-Mendelian trait transmission from mothers, is widespread across organisms but its evolutionary impact remains unclear.
  • Existing models often simplify maternal effects, necessitating a more comprehensive approach.

Purpose of the Study:

  • To review and extend a model of inheritance and evolution for multiple quantitative traits influenced by complex maternal effects.
  • To incorporate additional factors like shared family environment, sexual dimorphism, and paternal effects into evolutionary models.

Main Methods:

  • Review and extension of a quantitative genetics model.
  • Inclusion of non-Mendelian paternal effects and common family environmental influences.
  • Derivation of selection indices for artificial selection programs.

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Main Results:

  • Maternal inheritance creates distinct evolutionary dynamics due to its influence on selection response and time lags, leading to evolutionary momentum.
  • Selection response depends on both direct genetic variances and covariances and maternal characters influencing them.
  • Accounting for maternal inheritance can substantially enhance the efficiency of artificial selection.

Conclusions:

  • Maternal inheritance introduces unique evolutionary dynamics, diverging from Mendelian patterns.
  • The model provides insights into evolutionary trajectories in natural populations.
  • The findings have practical applications for optimizing artificial selection in domesticated species.