article: Polymorphism
links: Adaptation Primula vulgaris Charles Darwin Plasmodium Leaf-cutter ant Drosophila Heterozygous Fitness Genetics Genetic linkage E.B. Ford Evolution Locus (genetics) Africa Homozygous Human evolution Mimicry Chicago, Illinois Julian Huxley India Mammal Sickle-cell disease Primula Ant Hymenoptera Heterosis Natural selection