Figure 5.

Density of recombinations for all autosomes compared to a Poisson model. We scored the number of recombinations for each of 2072 chromosomes (all strains; Chr X excluded). The mean number is 2.43 recombination breakpoints per chromosome. The particular distribution assumes all 19 autosomes have a length of about 70 cM and this simplification accounts for the high. Χ² (125, P << 0.001, 10 df). Two hundred and fifty non-recombinant chromosomes were observed but only 182 were expected. There are also significantly more chromosomes with an apparent excess of recombinations. These deviations are of course expected because short chromosomes (<70 cM) will contribute more non-recombinants and long chromosomes (>70 cM) will contribute more highly recombinant chromosomes than predicted by the model.