Homozygous and hemizygous embryos have a week muscle phenotype, which is only slightly different from that of wild-type embryos.
The number of neurons in the dorsal organ (DO) ganglion are reduced in mutant embryos compared to wild type. The number of olfactory receptor neurons in the DO ganglion is normal in the mutant embryos.
Df(1)sc19 clones produce normal olfactory sensilla on the surface of the third antennal segment.
Embryonic muscles 27 and 18 are only rarely affected. But in 26% of the mutant hemisegments muscle 5 is abnormally formed or displaced. Muscle 25 is often abnormal or missing.
Hemizygous clones in the labellum lack all taste bristles; the taste pegs as well as the pseudotracheal structures are absent.
Hemizygous embryos were examined with polarised light microscopy and antibody staining: muscle pattern incomplete due to muscle absences.
Df(1)sc19 embryos show a partial hypoplasy of the CNS.
Homozygous females show a strong loss of tergite chaetae.
Gaps in the ventral cord and occasional clusters of cells are missing from the PNS, revealed by antibody staining for neuroblasts.
homozygous lethal Homozygous germline clones produce viable cells.