FlyBase curator comment: this entry is used to capture phenotypic information when the particular allele (or allele combination) used by the author could not be determined but the context of the experiment suggests that the phenotype being described is some kind of loss of function.
The 1o-3o fates of the dorsal epidermis are replaced with the 4o fate in mutant embryos.
In bowlunspecified homozygous embryos the proventriculus fails to form and the hindgut is short and wide, with duplicated boundary cell rows. The foregut fails to form the keyhole structure, as indicated by marker analysis and the lack of a gap in the visceral musculature over this region of the gut, and so remains as a narrow tube.
The dorsal cuticle phenotype of linunspecified bowlunspecified double mutant embryos is the same as that of bowlunspecified single mutant embryos.