Consider A/a and B/b are two pair of independently assorting genes. When AaBb selfcross, the phenotype of the offspring is 9(A_B_) : 3(A_bb): 4(aaB_+aabb). There are six states about this inheritance. Which of them are correct?①A and B interact each other in dominant epistasis.②A and B interact each other in recessive epistasis.③Gene A is dominant epistasis on gene B/b.④Gene a is recessive epistasis on gene B/b.⑤Gene B is dominant epistasis on gene A/a.⑥Gene b is recessive epistasis on gene A/a.