P-element insertion 135bp upstream of the Ubx start site at position -31.
lethal - all die before end of P-stage | recessive
some die during pharate adult stage | recessive
abdominal tergite 1
haltere posterior compartment
Severe bxd transformation, first abdominal tergite is missing, additional band of postnotal tissue and halteres are transformed to the wing in the posterior compartment.