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.
D1 is an enhancer of visible phenotype of upd1GMR.PB
D1 is an enhancer of eye phenotype of upd1GMR.PB
There is some uncertainty in the designation of D1, D3 and "D9" as dominant D alleles. The wing phenotype of D3 (a protein null) is similar, if not identical, to D1 when assayed in outcrossed individuals; it is thus possible that the phenotype of D1 itself is not due to changes at the D locus. D protein is ectopically expressed in the wing discs of D1 individuals and reversion of D1 is associated with loss of D expression in the wing disc.