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Fig. 4. Four genetic models used to investigate the effects of dominance and digenic epistasis on selection. 1, 2, 3, and 4 represent the four genetic models, i.e., pure additive yield genes (AD0), partial dominance yield genes (AD1), partial or overdominance yield genes (AD2), and digenic epistasis yield genes (ADE); Column a shows the three genotypic values on each of 20 yield genes for Models AD0, AD1, and AD2, and the gene 1 and gene 2 interaction for Model ADE; Column b shows the percentage of genetic variance explained by each gene or each epistasis network. All genes have the same frequency, 0.5, in the reference population used to estimate the genetic variation. Variation from pleiotropic genes was excluded. A and a are the two alleles on each locus. A and a, and B and b are the alleles on the two interacting loci.
