Heterozygotes with Abd-Biab9-tuh-3 exhibit genital defects with relatively high penetrance.
Heterozygous males have a 7th tergite, there is loss of pigment in the anterior of the 5th tergite, and the 6th sternite has bristles.
Homozygous larvae exhibit transformation of the ventral setal belts of abdominal segments 5, 6, 7 and 8 to segment 3 or 4 identity.
Both m and r function affected to some degree.