Fig. 3.—

The X chromosome of D. serrata is lacking in male-biased and enriched for female-biased genes. Male-specific tissues are shown in blue and female-specific in red. The number of sex-specific genes per tissue is shown in table 1. The dotted line is the random expectation for the percentage of biased genes per chromosome estimated from 1,000 permutations; numbers above chromosome labels indicate the number of genes in each bar, and asterisk indicates probablilty that observed value does not differ from expected: ***P < 0.001, **P < 0.01, *P < 0.05.