Got1^Crimea Got2^unspecified double homozygotes have reduced viability, especially under crowded conditions. Those animals that do not survive die as externally normal pharate adults, and those that do survive eclose later than their control siblings. Surviving females are usually sterile. The surviving double homozygotes do not show normal pattern preference behaviour, usually cannot fly, and they do not appear to be phototactic. 38% of flies have abnormal electroretinograms.