Aplant breeder is trying to develop a deep purple violet. she knows the violets come in deep purple, light purple, and white. she crosses two violets hoping to produce only the deep color. which parent plants should she use? a: at least one parent must be pp. b: both parents must be pp. c: at least one parent must be pp. d: both parent must be pp.

The correct answer is option (D) Both parent must be PP.

For a plant breeder to obtain only deep violet colored plants, both the parents should be of the genotype PP. If one parent is pp, only the deep violet colored plants are not produced due to presence of the genotypes producing purple and white plants. Similarly, if both the parents are Pp, the appearace of the deep violet plant is in the ratio 3:1, with only one deep violet plant. If one parent is Pp, then also variants of violets are produces. Only if both the parents are PP, deep violet plants are produced.

genotype-       PP            x               PP

gametes-          P             x                P

offspring-                        PP (deep violet).