"dronc[d5]" animals (Df(3L)NcZ homozygotes in which CG6685 function, but not Nc function, is rescued by homozygosity for P{CG6685+tDa}) show mid pupal lethality.
32.67% of the expected number of Df(3L)NcZ homozygotes which carry both P{drf} and P{CG6685+tDa} survive to eclosion. The remaining noneclosed animals develop to an advanced pharate adult stage.