title: Multiallelic selection polymorphism.
abstract: The existence and stability of an internal (i.e., completely polymorphic) equilibrium for viability selection at a single multiallelic locus is investigated. Generations are discrete and nonoverlapping; the population is panmictic, monoecious, and diploid. Various necessary and sufficient conditions for the existence of an internal equilibrium are established and applied to the loss of alleles. Some necessary conditions for the existence of an asymptotically stable internal equilibrium are also established. All these conditions are simpler and yield general biological conclusions more easily than the classical necessary and sufficient conditions.
authors.affiliation: Department of Ecology and Evolution, The University of Chicago, 1101 East 57th Street, IL 60637, USA. choman@uchicago.edu
authors.forename: Thomas
authors.initials: T
authors.lastname: Nagylaki
authors.forename: Yuan
authors.initials: Y
authors.lastname: Lou
mesh_terms: D000483:Alleles; D005787:Gene Frequency; D005828:Genetics, Population / Q000706:statistics & numerical data; D006801:Humans; D008957:Models, Genetic; D015233:Models, Statistical; D011110:Polymorphism, Genetic