Recombination rate for the four pedigrees. Recombination rates were calculated for bins of 1 Mb and plotted using a moving average of 5 Mb. On the x-axis, the genomic position is given in million base pairs. On the y-axis, the recombination rate is given in cM/Mb. Results for ILL, UIUC, USDA and ROS pedigrees are given in blue, red, green and grey respectively.