Genetic Distance Unit for Results Plots Use this parameter to specify the measurement unit of genetic distance to be plotted on the X-axis of the resulting p-value plots. Options include the following: Distance Unit Description cM centiMorgans. This unit represents the genetic distance equivalent to a 1% probability of a recombination event occurring between two markers located on the same chromosome. This is the default selection. Morgans Equivalent to 100 cM. To Specify the Genetic Distance Unit: Click on the radio button corresponding to your selection.