Figure 8.

Ectopic Ubx expression in the sensory organ lineage has different effects on bristle morphology depending on bristle identity or bristle location. (A) Wild-type second leg and (B) wild-type third leg. (C) Second leg in which Ubx has been expressed in the sensory organ lineage with the 109-68 Gal4 driver at 18°C. In the ectopic Ubx expression regime (C), the stout preapical bristle on T2 is transformed toward the morphology of the thin preapical bristle normally found on T3 (arrowhead), whereas short bristles on the ventral basitarsus of T2 can be transformed toward the long stout morphology of those on the T3 leg (arrows). The morphology of the T2 apical bristle remains largely unchanged in this ectopic Ubx expression regime (double arrowhead).