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ADDITIVE VARIATION MAINTAINED UNDER STABILIZING SELECTION: A TWO-LOCUS MODEL OF PLEIOTROPY FOR TWO QUANTITATIVE CHARACTERS
A. Gimelfarb 1
1 Department of Biology (Whitman), The University of Chicago,
Chicago, Illinois 60637
A model with two diallelic loci controlling two additive quantitative characters is suggested. One of the loci has a similar effect on both characters, whereas the second locus has an antagonistic effect on the two characters. Both characters experience direct stabilizing selection. The model yields a stable polymorphic state, with both characters maintaining genetic variation. The genetic correlation between the characters at the equilibrium is zero, in spite of the pleiotropic effects of the loci controlling them.
Submitted on June 23, 1985Accepted on November 15, 1985