title: Variation of scutellar bristles in Drosophila. XV. Systems of modifiers.
mesh_terms: D000818:Animals; D003433:Crosses, Genetic; D004330:Drosophila; D005260:Female; D014644:Genetic Variation; D005838:Genotype; D008297:Male; D010641:Phenotype; D012641:Selection, Genetic