D1/+ individuals have posterior alar lobe deletions.
Exhibits a dominant wing hinge phenotype.
D1 is lethal over both "Sai" alleles of mirr but other D alleles are viable, implying that this lethality is due to the 69D3-4 breakpoint of the D1 inversion. Dominant late pupal lethal interaction of D1 with eyD is probably not an integral aspect of the D phenotype as D4 and D5/D+;eyD/ey+ flies are viable. Viable when heterozygous with all lethal D alleles, the phenotype is the sum of the two D alleles.
Wings extended uniformly at 45o from body axis and elevated 30o above (occasionally sharply downcast and dragging). Alulae missing. Dorsocentrals and some other bristles reduced in number (Sturtevant, 1918; Plunkett, 1926). Head often deformed or split in postvertical region. Halteres turned down. Homozygous lethal. Nearly lethal in combination with eyD (Sobels, Kruijt and Spronk, 1951). Partially suppressed by sc alleles that remove postverticals (sc, sc4, sc6, sc7) but not by others (Df(1)ase-1, sc5) (Sturtevant). Classifiable in triploids. RK2A.