Variation for metrical characters in drosophila populations. 3. The nature of selection.
D000818:Animals; D003433:Crosses, Genetic; D004330:Drosophila; D014644:Genetic Variation; D005828:Genetics, Population; D006579:Heterozygote; D010641:Phenotype; D012641:Selection, Genetic; D013223:Statistics as Topic