Reciprocal dominant epistasis

Type of epistasis where only the phenotype of the double recessive gene pair (aabb) differs from all other combinations of the gene pair. Hence, a backcross of A.B . x aabb segretates as {aa.. + bb..} / aabb in the offspring in a ratio of 15:1. This type of inheritance may occur for seed shape, for example.
Synonym: cryptomery
BT: epistasis

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