Fig. 2
From: Effective purifying selection in ancient asexual oribatid mites
Per-gene differences in dN/dS ratios between reproductive modes. The histogram shows the distribution of per-gene differences in dN/dS ratios between asexual and sexual terminal branches in a tree comprising three sexual and three asexual oribatid mite species for 3539 orthologous loci under purifying selection (dN/dS < 1). To improve data presentation, the histogram range is limited to −0.1 to 0.1, representing 3539 out of 3545 orthologs. The distribution mean (−0.008; dotted line) is shifted to the left indicating overall lower dN/dS ratios at asexual as compared to sexual branches (Wilcoxon signed-rank test V = 4.84*106, P < 0.001). Frequencies of genes with significantly lower dN/dS ratios at asexual as compared to sexual branches or sexual as compared to asexual branches are coloured blue and red, respectively
