Most homozygous flies eclose with no morphological defects. Homozygous females are fertile.
Homozygous males are completely sterile and their seminal vesicles contain no sperm. The maintenance of germ stem cells and germ cell cytokinesis appears normal in the mutant testes. Properly coiled spermatids are not detected in the mutant testes. The total number of elongated cysts in the mutant testes is normal, but the number of pre-investment cone assembly cysts is reduced, and the number of cysts in which the investment cone has departed is increased compared to wild type. This suggests that the spermatids proceed to individualisation early but fail to coil properly, resulting in an accumulation of cysts in which the investment cone has departed.
The individualisation complexes are displaced from the outer region of the testis coil to the inner region in mutant individualising spermatids. No mature sperm are present in the seminal vesicle in mutant males.
Homozygotes have slightly smaller eyes than normal.