Figure 4.

Mean expansion of the genetic map in RI strains. The average is approximately 3.7 for 100 independent RI lines. The X axis can also be considered the mean number of recombinations per 100 cM in different RI strains. The X axis can be transformed into the total number of recombinations per strain by multiplying by the genetic length of the mouse genome in morgans (approximately 14 morgans; 2.25x = 31.5 recombinations/strain, 3.00x = 42 recombinations/strain, 4.0xx = 56 recombinations per strain; and 6.00x = 84 recombinations per strain).