Figure 19-24 Diagrams One of Mendel's Experiments Using the Round

Figure 19-24 diagrams one of Mendel's experiments using the round and wrinkled seed traits. Figure 19-24
Which of the following could be considered a true-breeding strain for the seed-shape phenotype?

A) all of the round-seeded plants produced in the F₂ generation
B) all of the wrinkle-seeded plants produced in the F₂ generation
C) all of the round-seeded plants produced in the F₁ generation
D) half of the round-seeded plants produced in the F₂ generation