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. 2010 Jul 21;2:591–601. doi: 10.1093/gbe/evq043

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© The Author(s) 2010. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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FIG. 3.— — Signs of selection acting on duplicate genes. (A) The number of Saccharomyces cerevisiae duplicate genes; (B) the number of S. paradoxus duplicates; (C) the number of S. cerevisiae LSDs; and (D) the number of S. paradoxus LSDs. Here selection is measured by the ratio of nonsynonymous (K_a) to synonymous mutations (K_s). A higher K_a/K_s ratio indicates that one member of a duplicate pair has more nonsynonymous substitutions.