Concept 3 Genes don't blend.
Gregor Mendel explains that breeding short and tall pea plants didn't produce a medium-sized plant.
To my surprise, I found that none of the individual traits I studied were blended in the offspring of a cross between two pure-bred parents. Furthermore, in the hybrid offspring, only one of the two traits was seen. I then had to figure out why only one trait was seen in the hybrid offspring of the pure-bred crosses.
Mendel spent time in his garden not just because of his interest in pea plants. Mendel liked gardening. One of his hybridization experiments led to a fuchsia plant that was marketed for a while as Mendel fuchsia.
If pure-bred snapdragon plants with white flowers are crossed to pure-bred snapdragon plants with red flowers, the offspring have pink flowers. What do you think happened?