試題詳解

12. In some plants, a yellow pigment is synthesized from a colorless precursor. In a cross between two parental plants, one yellow and the other colorless, an F1 generation was produced that was all yellow. The F2 produced from the F1 had 1075 yellow, 275 pink and 90 colorless plants. What mode of inheritance and phenotypic ratio do these results suggest?
(A) Incomplete dominance, 1:2:1 phenotype ratio
(B) Codominance, 9:6:1 phenotype ratio
(C) Dominant epistasis, 12:3:1 phenotype ratio
(D) Recessive epistasis, 9:3:4 phenotype ratio