Genotype of RIL CL-33. The genotypes of 3806 SFPs were evaluated via chip hybridization as being Col (green), Ler (red), or unknown (black) for the RIL shown in the a chromosome. Color intensity represents the likelihood of each genotype (see Methods). A clustering algorithm was applied to determine the precise location of the recombination events according to the likelihood of each genotype. This is shown in bright green or red, b chromosome. Recombination breakpoints are clearly defined for chromosomes 2 and 4 because they are well covered on AtGenome1. The c chromosome shows the genotypes obtained from low-resolution PCR genotyping with 74 markers (www.natural-eu.org) for comparison. The unknown locations of the recombination events are shown in black, c chromosome.