A5-A8 are transformed to A4, females lack genitalia, and there is a weak haploinsufficient transformation of A5-A8. Parasegments 10-13 are transformed to parasegment 9 in embryos.
Heterozygous males have a 7th tergite, there is loss of pigment in the anterior of the 5th tergite, and the 6th sternite has bristles. Some homozygous 'escapers' are seen.
Fails to complement iab-5 and iab-6 alleles.