As well as Mendel discovering modern genetics, his experiments also set an important precedent that defines all good scientific experiments. In particular, his methods demonstrated good practice in the collection of reliable data.
Which aspect of Mendel's experimental set-ups can claim to have achieved this?
In snapdragon plants, a cross between a red and white flowered plant results in pink flowered offspring due to codominance of alleles.
In the species that Mendel used for his experiments, a cross between a red-flowered plant and a white-flowered plant, did not result in any pink flowered plants in the next generation.