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. Author manuscript; available in PMC: 2010 Feb 10.
Published in final edited form as: Trends Genet. 2008 Jul;24(7):336. doi: 10.1016/j.tig.2008.04.007

Figure 1. The large X-effect in Drosophila hybrids.

Figure 1

The X chromosome has a conspicuously large effect on the sterility of backcross hybrid males between D. pseudoobscura (white) and D. persimilis (purple; modified from [79]). The x axis shows the percentage of fertile male flies obtained in the different chromosomal backcrosses that are depicted on the y axis. Similar results have been obtained in backcross analyses of hybrid sterility between many other species pairs, including Drosophila, mammals, Lepidoptera and birds (reviewed in [6]).