試題詳解

43. A plant has a double mutation: ctr (constitutive triple response, meaning it always shows the triple response regardless of ethylene) and ein (ethylene insensitive, meaning it cannot respond to ethylene). What would be its triple-response phenotype?
(A) It would display a normal triple response, as the mutations compensate for each other.
(B) It would not display the triple response, as the ein mutation makes it insensitive to ethylene.
(C) It would constitutively display the triple response, because the ctr mutation is dominant.
(D) Its phenotype would be intermediate between a wild-type plant and a ctr mutant.