Pupae expressing TwdlDΔ173-175.T:Zzzz\FLAG exhibit a readily observable squat phenotype.
Two copies of TwdlDΔ173-175.T:Zzzz\FLAG have a greater effect on body shape than a single copy. In particular, pupae carrying two copies of the mutant transgene have a mean axial ratio of 2.1-2.2.