Dsim\E(Ubx)1 produces no mutant phenotype on its own in an otherwise wild-type background.
Dsim\E(Ubx)1, Dsim\In(3R)Ubx has visible | dominant phenotype
Dsim\E(Ubx)1, Dsim\In(3R)Ubx has haltere phenotype
Dsim\E(Ubx)1/+ in combination with Dsim\In(3R)Ubx produces enlarged and flat halteres.