Heterozygotes have normal wings.
On the legs and wings of mutant adults mechanosensory bristles have two or more bracts.
Gap1B2/+ heterozygotes show wild type wing veins.
Average number of R7 cells per ommatidium is 2.9.
Mosaics in the follicular epithelium cause localized dorsalization of the embryonic cuticle, concomitant with localized disruptions in the nuclear localization of dl gene product.
Mutation has no effect on rhohs.sev rough eye phenotype.
Homozygous females lay eggs with a weak dorsalized egg shell morphology. The embryos are also partially dorsalized.
Rough eye phenotype. Ommatidia are improperly oriented and occasionally are fused. Ommatidia contain supernumerary cells that are characteristic of R7 cells. Supernumerary cells are derived from a cone cell precursor, or a mystery cell, that adopts a neural fate in the disc. Wings show additional longitudinal veinlet branches of the posterior crossvein and delta-like structures. One or two extra sex combs form in ectopic positions and in both sexes duplications of epidermal structures associated with bristles of the distal leg.