The maintenance of heterozygosity under the diffusion model.
D000483:Alleles; D002874:Chromosome Mapping; D004058:Diffusion; D005787:Gene Frequency; D005799:Genes, Dominant; D005808:Genes, Recessive; D014644:Genetic Variation; D005828:Genetics, Population; D006579:Heterozygote; D008954:Models, Biological; D009154:Mutation; D012641:Selection, Genetic