Additional file 4.

Number of polymorphic genes per chromosome. The wide part of the bars shows the number of genes with an absolute ratio greater than 1, while the narrow part shows the number of genes with an absolute ratio greater than 0.5. Total number of genes per chromosome (with percentage of polymorphic genes (ratio >0.5) in parentheses): chromosome I, 2,969 genes (28%); II: 3,588 (32%); III: 2,680 (28%); IV: 3,435 (30%); V: 5,400 (35%); X: 2,809 (24%).

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Volkers et al. BMC Biology 2013 11:93   doi:10.1186/1741-7007-11-93