 Phenotypes might, Johannsen noted, be a mix of several genotypes (as illustrated by the sole figure in the 1911 article; Churchill 1974). To remove the ambiguity of appearance—to be able to use phenotypes to distinguish genotypes—he relied on research that was flourishing after the rediscovery in 1900 of Gregor Mendel’s experiments on peas. Those experiments can be summarized as follows: