Expression of Hsap\YAP1Scer\UAS.cZa during wing development under the control of Scer\GAL4C5 increases wing size by 14%. Morphology of 4% of the Hsap\YAP1Scer\UAS.cZa-expressing wings is severely disrupted. Expression of Hsap\YAP1Scer\UAS.cZa causes patterning defects of the wings, with the fourth longitudinal vein broken into three segments.