Shows no dominant effect on telomeric Position Effect Variegation (PEV) in stocks carrying a variegating w^+mW.hs allele at the telomeres of the second and third chromosome.

Adult survivors of transallelic combinations of "hopeful" alleles show homeotic phenotypes. The wing is often half or less their normal size, bulbous, arched upward and curved inward in the shape of a cashew nut. The posterior compartment of the wing is more severely affected than the anterior compartment. Alula can be reduced or missing, posterior wing margin is missing and the flanking wing blade is eroded. This homeotic phenotype resembles that of the Cbx mutations, and is dominantly enhanced by Su(z)2⁴. Enhances z¹ eye color.