Eggs derived from hemizygous females show a cold-sensitive ventralised egg-shell phenotype. More than 95% of the ventralised eggs have a single dorsal appendage at 18oC.
Egg chambers exhibit doubling of the number of nurse cells, or in a small number of cases the egg chambers are bipolar or have less than 15 nurse cells. Phenotype is more severe at 25oC. At 18oC in the egg chambers that have the normal number of nurse cells the oocyte nucleus is enlarged (highly polyploid) and has a roughened appearance.