Df(3L)knittrigΔ1 embryos transheterozygous with Df(3L)h-i22 show reduced formation of ganglionic tracheal branches with significant penetrance - the majority of embryos show disruption in at least one ganglionic branch. No abnormal phenotype is detected for midline glial cells.
Df(3L)knittrigΔ1 flies transheterozygous with Df(3L)h-i22 show reduced viability and only rare escaper flies are found. Most mutants die during pupal stages or as pharate adults. Most escapers are unable to undergo complete wing inflation, causing wrinkled wings. Some escapers show partially inflated and abnormally opaque wings. Mutant pupal wings appar normal.