Dot plot comparing the order of chromosome 2 markers between D. mojavensis and D. buzzatii. The x-axis represents the position of all markers in the physical map of D. buzzatii , while in the y-axis markers were ordered according to their coordinates in D. mojavensis scaffold 6540. Each syntenic segment is identified by a number with inverted segments indicated by a negative sign. Also shown is the breakpoint graph  generated by connecting consecutive syntenic segments along D. buzzatii chromosome 2 with continuous lines and those along the D. mojavensis chromosome 2 with dashed lines. The result is eight rectangles and a more complex cycle comprising two concatenated rectangles (yellow) that correspond to the 10 inversions fixed between the two species.
Guillén and Ruiz BMC Genomics 2012 13:53 doi:10.1186/1471-2164-13-53