Larvae that are double mutant for ihog^DC1 and boi^C1 die 24 to 48 hours after hatching and never reach third instar (L3).

The viability of boi^C1; ihog^DC1 double mutants is rescued by the basal level of expression of ihog^{Scer\UAS.T:Hsap\MYC} in the absence of any Scer\GAL4 driver.

In boi^C1 hemizygotes, eye development is severely compromised in the presence of mitotic clones of cells mutant for ihog^DC1/ihog^DC1 leading to structural defects. Photoreceptor cell differentiation is impaired in the mutant cells.

The eye morphology in ihog^DC1 mosaics in boi^C1 hemizygotes is rescued by the basal level of expression of ihog^{Scer\UAS.T:Hsap\MYC} in the absence of any Scer\GAL4 driver.

In contrast to control clones, double mutant clones (homozygous ihog^DC1 clones in boi^C1 hemizygotes) in third instar wing imaginal discs often straddle the anterior-posterior boundary and form tight borders with both anterior and posterior cells. This modified segregation behaviour indicates that anterior cells lacking both ihog and boi sort out from the anterior compartment into posterior territory. However, similarly to wild-type cells, double mutant posterior clones of homozygous ihog^DC1 mutant cells in boi^C1 hemizygotes do respect the compartment boundary and do not sort into anterior territory.