How did a bizarre experiment on humble bread mold help unlock the foundations of modern genetics? In this episode, we dive into the remarkable story of the one gene one enzyme hypothesis and explore how a simple but revolutionary idea changed biology forever. What began as an attempt to understand heredity in fruit flies evolved into one of the most important breakthroughs in 20th century science, revealing that genes do far more than control superficial traits. They help direct the fundamental chemical processes of life itself.

This deep dive follows the pioneering work of George Beadle and Edward Tatum, who used X-rays and bread mold to prove that specific genes affect specific metabolic steps. Along the way, the episode explains how their work challenged old scientific assumptions, influ ...