Farmers had been selecting seed for ten thousand years.

Thomas Knight had crossed peas sixty years before Mendel and seen what happened.

Koelreuter had documented hybrid vigor a century before Mendel published.

Mendel did not discover something new.

He found the number inside the pattern.

The Experiment

Mendel was a monk in the Augustinian monastery at Brno — a man with a scientific education, a monastery garden, and a specific question.

He wanted to know if inheritance followed mathematical rules.

He chose Pisum sativum — garden peas — because they had clearly distinguishable traits, reproduced reliably by self-pollination, and could be cross-pollinated with precision.

He grew thousands of plants.

He tracked seven traits: plant height, seed color, seed shape, pod color, pod shape, flower position, flower color.

He counted every offspring.

Over eight years.

What the Numbers Said

When Mendel crossed tall plants with short plants,...