Heterozygotes have a withered wing phenotype. Mutant embryos begin to show abnormalities at stage 16. The lethal phase is at embryonic stage 16/first larval instar.
It is not known whether the lethality and withered wing phenotypes of the "90-17" mutant line are associated with the same gene.
"ethyl methanesulfonate" was stated as tentative. "diepoxybutane" was stated as tentative. "γ ray" was stated as tentative.