Segregation distortion caused by epistatic interactions. Significant segregation distortion (P < 0.01) for pairs of loci is shown in green (parental genotypes dominating) and in purple (recombinant genotypes dominating). Lines separate genomes (black) and chromosomes (grey). Both axes contain the markers segregating in the respective population, with the markers in the order of the chromosomes from 1 to 7. Populations (A) DH06, (B) DH07, (C) EAW74, (D) EAW78, (E) DH_LxA, (F) F2_LxT.