The mouse recombination map linked to the T31 radiation hybrid map: alignment of mapped framework markers in both TJL interspecific backcross maps and T31radiation hybrid maps. All maps are drawn to a uniform cM scale, and the RH maps are set to equal the length of the corresponding recombination map. Thus, the cR scale for each chromosome may differ. The recombination map from the combined TJL BSB/BSS mapping panels is represented on the left. Each tick mark on the recombination map represents a single crossover event; one crossover/188 animals equals 0.56 cM between crossovers. The RH map in the center of each chromosome panel shows the framework markers spaced by the cR distance between each pair of adjacent framework markers based on the data for those two markers only. Missing scores for all markers are inferred if flanking data are concordant. Lines join the two maps where the same framework marker is mapped in both systems. These lines are dashed when the marker is mapped only in the 94 animals of the BSS cross due to failure of the Mus spretus allele to amplify from heterozygotes. Open boxes over the chromosome line indicate intervals whose LOD fails to meet the LOD > 6 criterion for significant linkage (see text for discussion). To the rightof each chromosome framework map is graphed the RH retention frequency for each framework marker against its cR position in the map. Note that all retention graphs show the 15%–55% retention range, with the lower retention to the left, except the Chr 11 graph, which shows the range 0%–100% retention frequency.