"How should Spring bring forth a garden on hard stone? Become earth, that you may grow flowers of many colors. For you have been heart-breaking rock. Once, for the sake of experiment, be earth!"

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My experiments with single traits all lead to the same result: that from the seeds of hybrids, plants are obtained half of which in turn carry the hybrid trait (Aa), the other half, however, receive the parental traits A and a in equal amounts. Thus, on the average, among four plants two have the hybrid trait Aa, one the parental trait A, and the other the parental trait a. Therefore, 2Aa+ A +a or A + 2Aa + a is the empirical simple series for two differing traits.

— Gregor Mendel