Figure 6
Transcript abundance (FPKM) for different classes of neo-sex-linked genes. a) Neo-Y FPKM-levels in D. miranda males; in testis, neo-Y transcripts whose homologues on the neo-X have been deleted or silenced are expressed at significantly higher levels compared to transcripts whose neo-X homologues are expressed (Wilcoxon test: W = 63263, p < 10−8 for neo-X deleted genes; W = 42141, p < 0.01 for neo-X silenced genes). b) Neo-X FPKM-levels in D. miranda females. c) FPKM-levels of D. pseudoobscura transcripts which are homologues to neo-sex linked D. miranda genes; in testis, D. pseudoobscura transcripts whose homologues on the neo-X in D. miranda have been transcriptionally silenced are expressed at significantly higher levels compared to transcripts whose homologues on the neo-X are expressed (W = 42141, p < 0.01); the same observation holds true when the three D. pseudoobscura transcripts with neo-X deleted homologues are added to a combined “neo-X silenced or deleted” category (W = 44476, p < 0.01).