FIG. 3.

ban homeotic phenotypes. (A) Cbx phenotype of heteroallelic ban combinations in a Pc¹⁶ heterozygous context. Heteroallelic ban^Df(2R)311a/ban^l(2)k02512 flies as well as Pc¹⁶/+ flies have wild-type wings. Double-heterozygous ban^l(2)k02512/+; Pc¹⁶/+ flies display a curving of the wings that is indicative of the Cbx phenotype. This phenotype is enhanced in heteroallelic ban^Df(2R)311a/ban^l(2)k02512; Pc¹⁶/+ flies. (B) Sex comb teeth normally absent in wild-type males (left) are observed on the mesothoracic tarsus in ban^Δ11Φ/ban^l(2)k02512 males (right). (C) Enhancement of the genetic interaction between Trl and Ubx. Ubx¹³⁰/+ flies display slightly enlarged halters (top panel) compared to the wild type. The expressivity of this transformation is higher in Trl^13c/Ubx¹³⁰ flies, in which a clear transformation of halter to wing was present in 6.3% (n = 142) of the flies, whereas it was never found in Ubx¹³⁰/+ flies. In ban^l(2)k02512/+; Trl^13c/Ubx¹³⁰ flies, this transformation was much more frequent (18% [n = 204]; middle and bottom panels) and was often accompanied by a notal transformation (arrow in bottom panel).