homozygous somatic clones in the eye lead to the formation of ommatidia containing one additional photoreceptor cell. For an ommatidium to show this phenotype, it is sufficient for 2 of the photoreceptors R2 to R5 to be mutant, but no particular cell of this group need be.
The external surface of the eye is irregular in fafFO8
flies and most facets contain more than the wild-type number of photoreceptor cells.
flies have a rough eye phenotype, due to the ommatidia containing more than the normal number of photoreceptor cells.
BrdU incorporation resembles wild type in fafFO8
third larval instar eye discs.
Most facets of homozygotes contain more than the normal complement of 8 photoreceptor cells, many facets have extra R7 cells and a small proportion have missing R7 cells.
Mutation causes no significant alteration to the variegated eye phenotype of In(1)wm4h
Average fraction of wild type facets is ~4.5%.
Eyes roughened due to abnormalities in the hexagonal facet array: most facets include 1-3 extra outer photoreceptor cells which are probably mystery cells. Ovaries of homozygous females are normal in appearance but the embryos produced never form syncytial blastoderm and all fail to hatch.