Rare escapers expressing B0404B0404 under the control of Scer\GAL4dpp.blk1 lack the arista. The wing is shortened distally and roundish. Wing vein L3 may not extend to the margin.
The wing is shortened and roundish in flies expressing B0404B0404 under the control of Scer\GAL4dpp.blk1. The wing veins are affected and vein L3 does not always extend to the margin.