rl9/rl2 flies lack the R7 photoreceptor cell and some outer photoreceptors. This phenotype is dominantly suppressed by aoppok-1.
Hemizygous larvae completely lack imaginal discs and die. Individuals die as pupae when heterozygous with rl1 or rl6.
L3 larval lethal as hemizygote no imaginal discs pupal lethal when heterozygous with rl1 or rl6 (Hilliker, 1976).