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Fig. 7. The QA motif is preferentially required for the repression of leg trichomes. Genotypic series of T2p trichome repression (Oregon-R background shown): (A) Ubx⁺/Ubx⁺ > (B) Ubx^–/Ubx⁺> (C) Ubx^QA/Ubx^QA > (D) Ubx^QA/Ubx^–. Ubx⁺/Ubx⁺ (A) and Ubx^–/Ubx⁺ (B) T2p legs had similarly sized large naked valleys lacking trichomes (bracketed in red). Ubx^QA/Ubx^QA (C) and Ubx^QA/Ubx^– (D) T2p naked valleys were highly reduced such that nearly the entire leg had trichomes. Genotypic series of T3p trichome repression: (E) Ubx⁺/Ubx⁺ > (F) Ubx^–/Ubx⁺ > (G) Ubx^QA/Ubx^QA > (H) Ubx^QA/Ubx^–. Ubx⁺/Ubx⁺ (E) and Ubx^–/Ubx⁺ (F) T3p legs had a similarly limited area of trichomes distally (small red arrows), although Ubx⁺/Ubx⁺ (E) also had some ventral trichomes (small red arrow) owing to a recessive allele (see text). Ubx^QA/Ubx^QA (G) and Ubx^QA/Ubx^– (H) T3p legs had large ventral and distal patches of trichomes (large red arrows) that generally fused. Ubx^QA/Ubx^– T2 legs (D) generally had an eighth row of bristles (cyan arrow), a phenotype of Ubx^– clones (D.L.S., unpublished). Ubx^QA/Ubx^– T3 (H) often had ectopic edge bristles (green arrows), a transformation from T3 towards T2 identity, as well as more robust dorsal and proximoventral bristles. Distal is rightwards, dorsal is upwards.

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