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Divergence between Daphnia galeata and D. pulex measured as Ka/Ks ratios between 1:1 orthologs. (A) Sequence divergence for male-biased, female-biased, and unbiased genes. (B) Sequence divergence for the different categories of sex-biased genes according to the degree of sex bias. Outlier genes with values > 0.8 are not shown on the plot, but were included in the statistical analysis. Significance was determined by a Wilcoxon test. *P< 0.05, **P < 0.01, ***P< 0.001.
