Ubx175.1/Ubxbx-3 flies look almost wild type, though disruption of pairing by means of a rearrangement causes a strong transformation, indicating that transvection has been reduced. Ubx175.1/Ubxpbx-1 flies show an almost wild type haltere, but in combination with the pairing-disrupting T(2;3)bwVDe3 the phenotype is like that of Ubx1/Ubxpbx-1 or Ubxpbx-1/Df(3R)P9, showing there is no transvection without pairing.