On which organism Beadle and Tatum worked to propose one gene—one enzyme hypothesis

Beadle and Tatum’s experiment
Beadle and Tatum irradiated Neurospora crassa with X-ray which resulted in mutant genes that could not synthesise the specific enzymes required for nutrition. Thus they proposed the one-gene-one-enzyme hypothesis in \(1948\) which states that each gene encodes a single enzyme.

Final answer
(C) Neurospora crass