Fig. 1

Differential gene expression across the P supergene region. Expression differences in prepupal (blue) and day-1 pupal (red) wing discs for 191 transcripts with a BLASTn hit to the interval between 1,126,790 bp (gene Hmel000020) and 1,722,158 bp (gene Hmel000053) on H. melpomene genomic scaffold 215006 (cf. [35]). Significantly (FDR-adjusted p value < 0.001, see grey dotted threshold line) differentially expressed transcripts are indicated with bright colours. The corresponding H. melpomene genes are highlighted with orange (in case the differentially expressed transcripts match exons and introns) or yellow (in case the transcripts match introns only). The four examined morphs belong to three different gene orders: (1) ancestral (silvana), (2) first inversion (bicoloratus), and (3) first + second inversions (tarapotensis and aurora)