In Mendel's first set of experiments, all of the offspring presented the same
form of each trait. Which of the following statements summarizes his first set
of experiments?
A. Mendel crossed nonpure plants with the same form of each trait.
B. Mendel crossed pure-breeding plants with different forms of each
trait.
C. Mendel crossed pure-breeding plants with non-pure plants with
the same form of each trait.
D. Mendel crossed pure-breeding plants with the same form of each
trait.