Approximately 11kb insertion in a EcoRI/HindIII fragment that includes two Ubx transcription start sites.
Characteristic null Ubx phenotype. Homo- and hemizygotes show parasegments 5 and 6 transformed to parasegment 4 and slight thoracic transformation of abdominal segments A2 to A7. In clonal analysis Ubx195rx1 tissue looks as for pre-existing Ubx null alleles. Transheterozygous combinations with many different classes of Ubx mutation, and wild type indicate that Ubx195rx1 hyperactivates the homologous Ubx gene. Effect is pairing-dependent. Mutation has strong positive effect on transvection, which, unlike other cases of transvection in Ubx, is not zeste-dependent.
