Genotyping Generation (n) Use this parameter to specify the number of generations for crosses generated using either random mating over n -1 generations of inbred lines ( IRILself ) or intercrossing of a line randomly mated for n generations ( RFn ). To Specify the Number of Genotyping Generations: Specify SFn or RFn as the Cross Type to activate this field. Left-click in the text field and type the desired value.