Concept 3 Genes don't blend.
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?