Insertion of a duplicated y sequence (from -69bp through the whole y gene) in between two P-elements in the ac-sc regulatory region that are present in the progenitor allele sc+s.
visible
anterior orbital bristle
humeral bristle
Flies have a weak sc phenotype; humeral bristles and some anterior orbital bristles are missing.
scls4 has phenotype, non-suppressible by su(Hw)V/su(Hw)2
The phenotype is unaffected by su(Hw)2/su(Hw)V.