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Model of interaction of awnness genes with multiple dominant epistatic effects. (A). A, B, and H are dominant epistatic genes over L. The strength of their epistatic effect is in the order of A-B-H. The A gene functions on both the central row (CR) and lateral row (LR). The B gene exerts its epistatic effect only on LR. (B). The final awn phenotype is determined by the supremacy of the epistatic gene. The thicker arrows indicate genes with a stronger epistatic effect.
