Polytene chromosomes normal.
gypsy insertion at map position -23kb.
Transformation of posterior portion of haltere towards wing, loss of A1 tergite and appearance of T3 legs on A1. Ventral setal belt of A1 is transformed toward that of T3 and ventral pits appear on abdominal segments A1 to A7, inclusive.
Does not affect the frequency of the trx bithorax-variegated phenotype in heterozygous combination with Df(3R)red-P52.
Ubxbxd-55i/Df(3R)Ubx109 flies show complete loss of the first abdominal tergite and occasionally have a seventh leg, but show little transformation of the posterior third thoracic segment.
Ubxbxd-55i has phenotype, suppressible by su(Hw)unspecified
Green.
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.