zen2 << bk1 << pb << Antp << bk2
Antp P1 sequences fused to pb, causing ectopic pb expression under Antp P1 control.
Heterozygous males have a reduced number of sex comb teeth on the first leg.
Dominant effect on thorax is associated with diminished expression of Antp on the homologous chromosome, which is, in turn, a consequence of ectopic pb expression in thorax due to pb gene on the Df(3R)SCB-XL2 chromosome being under the regulation of the Antp P1 promoter.
Completely penetrant labial and maxillary palp phenotype. Temperature does not affect the phenotype.
Df(3R)SCB-XL2/pb- flies show the maxillary and labial palp phenotypes of pb null flies.