Type of epistasis where the dominant allele A is epistatic over (suppresses) alleles B/b. In other words: if the dominant allele (A) for gene A/a is present, then the effect of another gene (B/b) does not come to expression. Hence, a backcross of “A.B.” x “aabb” segretates in the offspring as “A…” / “B.aa” / “aabb” in a ratio of 12:3:1.
BT: epistasis