Fig. 1.

Tandem duplications in 20 sample strains of Drosophila yakuba. Regions spanned by divergently oriented reads are shown with sample strains plotted on different rows, whereas axes list genomic location in Mbp. Duplications are more common around the centromeres, especially on chromosome 2. Frequencies are shaded in grayscale according to frequency, with high-frequency variants shown in solid black. The D. simulans X chromosome appears to have an excess of high-frequency variants in comparison to the D. simulans autosomes and the D. yakuba X chromosome.