Polytene chromosomes normal.
Transformation of posterior portion of haltere toward wing, replacement of A1 tergite by post-notal tissue, no extra legs. A1 setal belt is intermediate between A1 and T3 type belts. Ventral pits on all abdominal segments.
Ubxbxd-K/Df(3R)Ubx109 flies show variable loss of the first abdominal tergite and the posterior haltere is variably enlarged. These flies do not have extra legs.
Ubxbxd-K has phenotype, suppressible by su(Hw)unspecified
Kuhn.
A 3.4kb repetitive element is inserted at map position -6.5kb but is probably not responsible for the mutant phenotype, as Ubxbxd-K is completely suppressible by mutations in su(Hw).
The phenotype of a number of combinations of Ubx mutations has been investigated to determine the role of the bxd regulatory region in the modulation of Ubx expression.