Figure 5

Two-QTL epistasis on chromosome 3. (A) The upper left triangle contains the LOD scores for the epistasis, e.g., log₁₀ likelihood ratio comparing the full model (two QTLs plus interaction) to the additive model (two QTLs); the lower right triangle contains the LOD scores for the full model, e.g., log₁₀ likelihood ratio comparing the full model to the null model. (B) The phenotype means for each group defined by the genotypes at two epistatic loci.