Theoretical and Applied Genetics

, Volume 84, Issue 3, pp 323–329

Asymmetrical correlated responses to selection under an infinitesimal genetic model

  • B. Villanueva
  • B. W. Kennedy

DOI: 10.1007/BF00229490

Cite this article as:
Villanueva, B. & Kennedy, B.W. Theoret. Appl. Genetics (1992) 84: 323. doi:10.1007/BF00229490


Asymmetry in correlated responses to selection is expected when more than one cycle of selection is practised due to changes in genetic parameters produced by selection. In large populations, under the infinitesimal model these changes are due to linkage disequilibrium generated by selection and not to gene frequency changes. This study examines the conditions under which asymmetrical correlated responses are to be expected when an infinitesimal model is considered. Asymmetrical correlated responses in two traits in respect to which trait is selected are expected if the two traits have different heritabilities. Predicted asymmetry increases with the absolute value of the genetic correlation between the two traits, the difference between the two heritabilities, the intensity of selection and the number of generations of selection. Linkage disequilibrium generated by selection should be taken into account in explaining asymmetrical correlated responses observed in selection experiments.

Key words

AsymmetryCorrelated responseSelectionInfinitesimal modelHeritability

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • B. Villanueva
    • 1
  • B. W. Kennedy
    • 1
  1. 1.Centre for Genetic Improvement of Livestock, University of GuelphGuelphCanada
  2. 2.Genetics and Behavioural Science DepartmentScottish Agricultural CollegePenicuikScotland