Wing hairs in the most anterior region of the wing point towards the anterior margin in mutants, as opposed to distally as in wild type. Most of the wing cells form three to five hairs and often, one or two of these hairs are very small.
The multiple wing hair phenotype is limited to the mutant cells in wings containing homozygous clones.
Homozygous clones have a multiple wing hair phenotype (3.54 hairs/cell).
Homozygous clones on the dorsal head cause a dramatic decrease in hair length, but no obvious appearance of multiple hair elements.
The degree of mosaicism of the mow1 phenotype is increased if the fly is also heterozygous for mwhunspecified.