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Number of Duplications per bp on the X and major autosomes in Drosophila yakuba and D. simulans. The X chromosome in D. simulans contains an excess of duplications in comparison with the autosomes. Chromosome 2 R also contains more duplications per bp than chromosome 3 R but no other autosomes are significantly different. Chromosome 4, the dot chromosome, has more duplications per mapped bp in both D. yakuba and D. simulans than any other chromosome.
