Mendel's Experiments and Heredity

What would you call the first generation of pea plants crossed? For example, a purple and white flower type.

The understanding of how information is passed from one generation to the next is called?

If you crossed two tall plants and the seeds produced a ratio of three tall to one short, how would you explain the one short plant (since neither of the adult plants were short and tall is dominant to short)?

Which of the following statements was not a reason why pea plants were a great tool to study heredity?