XVIII.—Studies on Reproduction in Wild-Type and Female-Sterile Mutants ofDrosophila melanogaster(Meig)

Abstract

Drosophila mutants are usually defined by structural characteristics exhibited by the adult fly. In certain cases (homozygous lethal mutants and female-sterile mutants) the mutant may or may not be defined structurally, but does exhibit the physiological characteristic of death at some stage.The females of homozygous lethals are sterile, for the F1; represented by the germinal cells, dies with the mother. The term female-sterile, however, is applied to the well-known cases in which the mother but not her F1 achieve imaginal life.