The number of cells in the epithelium of the hindgut at stage 13 is significantly reduced compared to wild type in stg4/Df(3R)BSC500 embryos.
stg4/Df(3R)BSC500 stage 13 embryos show defects in the left-right asymmetry in their hindgut, with some embryos showing no asymmetry, and other showing inverse asymmetry.
stg4 mutant embryos exhibit mitotic arrest in cell division cycle 14.
The average number of crystal cells per embryo is reduced in homozygous stage 13-14 embryos compared to wild type.
Eye of adults heterozygous with stghwy are normal, though missing macrochaetae phenotype remains.
Transheterozygotes with stgS114302b produce adult escapers that lack scutellars and many other bristles, have rough eyes and occasionally lack a haltere or have notched wings.
Primordial germ cells (PGCs) leave the posterior midgut (PMG) at the same time as in wild type and no significant differences in their migration to the gonadal mesoderm were observed.
Heterozygotes with DrMio and Dr1 are semi-lethal, 10-30% adults survive to eclosion, surviving adults exhibit reduced eye, deranged bristle pattern on the thorax, abdomen, legs and wing margins and locomotor defects so the flies could hardly move.
No cell division occurs in the ectoderm after the blastoderm stage in homozygotes. Cell death does not appear to occur in late embryos (stage 16) in contrast to wild-type.
The mesoderm is able to disperse and spread out normally after gastrulation in stg4 mutant embryos.
Mutants show a nonspecific reduction in the number of differentiated cuticular structures.