bk1 << l(1)9e3-21 << l(1)XR49 << bk2 << nonA
Hemizygous male embryos lack the base of the mouth hooks and dental sclerites. The lateral process is truncated near the H-piece, which is also disrupted. The few remaining cirri are misshapen and disorganised. The maxillary portion of the maxillary sense organ does not fuse with the antennal portion.
Heterozygous adults show a weakly penetrant β lobe fusion phenotype in the central brain.
Does not cause unconditional lethality in hybrid females when heterozygous with D.simulans chromosome.