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The genetic correlation between characters maintained by selection, linkage and inbreeding

Published online by Cambridge University Press:  14 April 2009

Russell Lande
Affiliation:
Department of Biophysics and Theoretical Biology, The University of Chicago, Chicago, Illinois 60637, U.S.A.
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Mutation is modelled in two quantitative characters under separate genetic control in a large population. A bivariate pattern of selection acts to correlate the characters and, without pleiotropy, their genetic correlation is due entirely to linkage disequilibrium. Data on spontaneous mutation, the effective number of genes, and the intensity of natural selection on quantitative characters are used to evaluate the models. It is concluded that, even when selection favors a high correlation between the characters, with random mating and no linkage between loci influencing different traits the genetic correlation between characters is likely to be small in magnitude. A genetic correlation of large magnitude can be maintained only if the loci influencing different characters are tightly linked, or there is a high level of inbreeding in the population created by frequent mating between closely related individuals.

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Type
Research Article
Copyright
Copyright © Cambridge University Press 1984