TABLE 2

Classification of genes by their sex-biased expression in all three species

CategoryNo.% of total
Non-sex-biased1,31410.5
Female-biased4,80838.4
Male-biased3,65229.2
Switch between nonbiased and female-biaseda1,0178.1
Switch between nonbiased and male-biaseda1,60412.8
Reversals of sex-biased expression1120.9
Total12,507100.0
  • a The direction of change is dependent on the ancestral expression bias, which is not known. Genes in these categories are those that show the same type of sex-biased expression in one or two species and are nonsex biased in the other species.