Figure 2.

Expression divergence rates of the four-species orthologs. (A) Median standard deviations of expression ratios (male/female) of carcass and reproductive tissue male-biased (blue) and female-biased (red) among the four-species orthologs. A Wilcoxon rank-sum test is used to test for significant differences when comparing sex-bias gene expression categories between the sexes (blue asterisks) or to unbiased genes (gray asterisks) and indicates: (*) P-value < 0.05, (**) P-value < 0.001. (B) The number of genes that show qualitative sex and/or tissue bias switches compared to their An. gambiae orthologs increases with evolutionary distance.