Chromosomal inversion that removes exon 1B.
Wings extended at 90o from body axis, often drooping. The tegula (small plate at base of wing) uniformly duplicated and adjoining anterior supra-alar bristle usually twinned as well. RK2A.
Allele class: Tg
E. B. Lewis, 1962.
Molecular and genetic analysis of revertants suggest that the dominant phenotype is due to misexpression of dpp.