Figure 5.
Divergence at synonymous sites for orthologs of C. briggsae and C. nigoni is higher for genes linked to arm domains than center domains for all chromosomes (all Wilcoxon test P ≤ 0.0035). The chromosomes also differ significantly from one another in average substitution rates (F(5,5085) = 72.0; P < 0.0001), with Chromosome I being lowest and Chromosomes V and X being highest (Tukey's range test). Horizontal lines indicate mean dS for genes in center domains (cyan, dS = 0.186) or arms (magenta, dS = 0.259) across all chromosomes. Loci with strong codon bias (ENC < 45) excluded from analysis.
