Visualization of marker-dense regions in barleychromosomes. DArT and non-DArT loci were separately collapsed into bins by comparing their segregation signatures across populations. The bins of each dataset were arranged in the order of the consensus map. The number of loci per bin and the distance between adjacent bins (inter-bin distance) were then averaged across a 19-bin sliding window that was moved across each chromosome. Approximate centromere positions are indicated by horizontal two-sided arrows.