Figure 2. Schematic representation of crossing scheme .

Crossing scheme is characterized by increasing population sizes in the backcross generations and selection for target segments in the final backcross generation. The parts highlighted in gray represent one branch of the crossing scheme. Sub-populations are indexed by , and , where is the respective backcross generation, is the respective chromosome, is the respective chromosome half, is the respective target segment; and denote individuals selected for the respective selection regions.