7kb insertion in the transcription unit.
rb10/rbS1 flies have a normal landing and optomotor response and respond normally to stationary visual stimulation. They show abnormal behaviour in Buridan's paradigm, a test for alternating pattern fixation. Df(1)rb1/rb10 flies have a normal landing and optomotor response and respond normally to stationary visual stimulation. They show abnormal behaviour in Buridan's paradigm, a test for alternating pattern fixation; fixation of visual landmarks is significantly impaired and there is a highly significant increase in walking speed between the landmarks compared to wild type.