Allelic contracomplementation possible mechanism for initiating sympatric speciation.
D000483:Alleles; D000818:Animals; D005075:Biological Evolution; D004331:Drosophila melanogaster; D005804:Genes, Lethal; D005816:Genetic Complementation Test; D005828:Genetics, Population; D006579:Heterozygote; D009154:Mutation