The average recombination rate for each major chromosome arm.

Note that RG has higher recombination rates than that of RAL. This difference could be explained partially, but not entirely, by a difference in population size. In RG, the average recombination rate of X is substantially higher than that of the autosomes. In both populations, arm 3R has a notably lower recombination rate than do the other arms. We also analyzed a smaller RAL dataset down-sampled to match the sample size of RG. The numbers in parentheses denote sample sizes.