Calvin B. (Calvin Blackman) Bridges

Born in 1889, Calvin B. Bridges was an American geneticist whose career was closely tied to the breakthrough years of modern genetics. He studied and worked with Thomas Hunt Morgan’s group, the influential “Fly Room” researchers who used the fruit fly Drosophila melanogaster to investigate heredity.

Bridges is best remembered for research on chromosome behavior, including evidence from nondisjunction that strongly supported the idea that genes are carried on chromosomes. He also contributed important work on mutation, chromosome mapping, and the careful description of Drosophila stocks that made the organism indispensable for later biological research.

He died in 1938, but his work remained deeply influential. For listeners interested in the history of genetics, Bridges stands out as one of the practical, detail-minded scientists who helped transform a new theory of inheritance into an experimental science.