Protected polymorphism in the two-locus haploid model with unpredictable fitnesses.
In an unpredictable environment, the distributions of alleles from which polymorphism can be maintained forever belong to a certain set, the C-viability kernel. Such a set is calculated in the two-locus haploid model, as well as the corresponding fitnesses at any time which make this maintenance possible. The dependence of the C-viability kernel on the set U of admissible fitnesses and on the recombination rate r is studied. Notably, the C-viability kernel varies rapidly in the neighborhood of equal fitness of AB and ab; it becomes empty when ab has a fitness below a certain function, which is delineated, of the recombination rate. The properties of the two-locus model under constraints, out of equilibrium and with unpredictable selection are thus presented.
Bonneuil
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Institut National des Etudes Démographiques, Paris, France. bonneuil@ined.fr
Saint-Pierre
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D000483:Alleles; D000818:Animals; D003198:Computer Simulation; D005838:Genotype; D006239:Haplotypes / Q000235:genetics*; D006801:Humans; D008957:Models, Genetic; D011110:Polymorphism, Genetic / Q000235:genetics*