Su(z)2^1.a5 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.

Isolated on the basis of reverting the dominant z¹ eye color suppression associated with Su(z)2¹. In a z¹, w^is/Y background, Su(z)2^1.a5 produces an orange eye colour similar to that found in z¹, w^is/Y;+/+. The reversion event simultaneously reverted the ability of Su(z)2¹ to enhance the dominant loss of chaetae phenotype associated with Su(z)2^vg62 (Df(2R)vg62) and Su(z)2^vgD (Df(2R)vg-D). Heterozygotes with Df(2R)vg-D are viable. Hemizygotes die as larvae/pupae.