Heterozygotes have head defects, including reduced eyes and ectopic maxillary palps behind the antenna (20% penetrance for the ectopic maxillary palp phenotype).
Heterozygous males have ectopic antero-ventral bristles on the head.
Adult head deformations: lower eye and orbital structures are absent. Homozygotes have bulbous growths in the place of missing eye tissue, these may be duplications of the second antennal segment.
Adults have ventral eye and orbital tissue missing.
Loss of ventral eye and orbital regions in the adult head. Head defects phenocopied by Dfdhs.PK constructs and heat-shock constructs of the human Hox4.2 in cells of the eye disc during third larval instar development.
dominant Eyes reduced ventrally and anteriorly, or furrowed. Vibrissae tufted. Extremely variable, often overlapping wild type, but usually excellent character with Ly or at 19oC. Classifiable in single dose in triploids (Schultz, 1934). Muller reported an occasional homozygote as extreme dwarf with flimsy wings. RK2.