Patterns of sex-bias over genes.

<p><b>A.</b> Numbers of genes that are female-biased (red) or male-biased (blue) in all four species across all chromosomes, as compared to the expected chromosomal distribution (black) proportional to number of genes on each chromosome. Note the difference in scale on the Y-axis between the female-bias and male-bias comparisons. <b>B.</b> Numbers of genes that are not female or male-biased in any of the four species, on each chromosome. <b>C.</b> Genes that are female or male-biased in only one species (and unbiased in the other three). <b>D.</b> Observed and expected chromosomal distributions of genes that are female or male-biased only in <i>D</i>. <i>pseudoobscura</i>. <b>E.</b> Genes that are female or male-biased on the X chromosome. Statistically significant results (p< 0.05) from chi-squared tests indicated with *, see <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1005592#pgen.1005592.s013" target="_blank">S2</a>–<a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1005592#pgen.1005592.s016" target="_blank">S5</a> Tables.