title: Variation for metrical characters in Drosophila populations. II. Natural selection.
mesh_terms: D000483:Alleles; D000704:Analysis of Variance; D000818:Animals; D003433:Crosses, Genetic; D004331:Drosophila melanogaster; D005260:Female; D005298:Fertility; D005787:Gene Frequency; D005796:Genes; D014644:Genetic Variation; D005828:Genetics, Population; D005838:Genotype; D006579:Heterozygote; D008297:Male; D010641:Phenotype; D012641:Selection, Genetic; D012737:Sex Factors