Mutants fail to expand their wings following eclosion. The epithelial-mesenchymal transition (EMT) is blocked in the mutant wings following eclosion, but chromatin condensation and elimination of nuclei still proceeds.
Delamination does not occur in bae1 mutant wings. Even a whole day after eclosion, a bae1/Y wing shows no delamination.
Homozygous flies never expand their wings after eclosion. About 5% of heterozygous females also exhibit the phenotype. There are no apparent structural defects in mutant wings. In gynandromorph studies, the wing phenotype is found to be non-autonomous, and that either both wings have the phenotype or neither.