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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Curr Opin Genet Dev. 2008 Oct 16;18(6):493–498. doi: 10.1016/j.gde.2008.09.006

Figure 2.

Figure 2

Trends in sex-biased gene content on the X chromosome in different species. Karyotypes for the heterogametic sex are shown for each species. Blue arrows indicate the overall trend for male-specific genes; red arrows indicate the overall trend for female-specific genes. In the genus Drosophila, male-biased genes are depleted on the X chromosome while female-biased genes are enriched. C. elegans shows the same overall trend as Drosophila. Chicken is a species with ZW sex-determination system where the Z chromosome is enriched for male-biased genes and depleted for female-biased genes. A. gambiae has an even distribution of male-biased genes among the chromosomes. In the mouse, both male-biased and female-biased genes are enriched on the X.