Extra humeral bristles are formed. Does not interact with ph-d1
Transformation of sternopleural bristles on the propleura to mesopleural identity.
Extra bristles on humerus. Homozygous viable.
Extra bristles on humeral patches of heterozygote. Humeral bristles more numerous in homozygote with a streak of hairs below humerus toward base of first leg. Homozygous viability 90% wild type. RK2A as heterozygote.