how did Mendel's experiments disprove the idea that we are simply a "blend" of our parents?

how did Mendel's experiments disprove the idea that we are simply a "blend" of our parents?
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It was disproved when he did his experiments (F1 and F2). When he cross-pollinated the tall and short pea plants;he was expecting a medium sized plant, but instead the pea plants were 100% tall. In the F2 generation he cross-pollinated a tall pea plant with another tall pea plant and he got 75% tall and 25% short. This shows it's not a blend,but a random pick. Also in the F1 generation with the cross-pollination of the tall and short pea plants he thought he was going to get medium sized pea plants and neither of the plants he cross-pollinated were medium sized or a blend.
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