Consensus map features by marker type. (A) Frequency with which individual markers were mapped in the ten populations. The 'bPb' DArT markers from the Pst I/Bst NI representation (assayed across all populations) and the 'bPt' markers from the Ps tI(Taq I) representation (only assayed in the Steptoe/Morex population) were separately compared against other markers (SSR, RFLP, STS). (B) Map resolution. Loci from each of four datasets (all markers, all DArT markers, 'bPb' DArT markers, other markers) were collapsed into bins by comparing their segregation signatures across populations. The bins were arranged according to the consensus map order, and the distances between pairs of adjacent bins were calculated. (C) Map quality. Loci from two datasets (all DArT markers, other markers) were jointly collapsed into bins by comparing their segregation signatures across populations. The bins were arranged in the order of the consensus map, and the number of singletons for the locus with the highest call rate within each bin was counted and expressed as a percentage of the number of genotype calls.