What experiments demonstrated that DNA is the genetic...

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Key Concepts

Hershey–Chase Experiment

The Hershey–Chase experiment further solidified the role of DNA as the genetic material by using bacteriophages. By labeling the DNA and protein components of the phages with different radioactive isotopes, the experiment showed that only the DNA entered bacterial cells and directed the production of new phages, conclusively demonstrating that DNA, not protein, carries genetic information.

Griffith’s Experiment

Griffith’s experiment was a foundational study in bacterial transformation where non-virulent strains of bacteria were transformed into virulent forms by exposure to heat-killed virulent bacteria. This experiment introduced the concept of a ‘transforming principle’ that could transfer genetic information from one organism to another, suggesting that some molecule was responsible for heredity.

Avery–MacLeod–McCarty Experiment

Building on Griffith's findings, the Avery–MacLeod–McCarty experiment provided direct evidence that DNA was the transforming principle. By using enzymatic treatments to selectively destroy proteins, RNA, or DNA, they demonstrated that only the destruction of DNA eliminated the transformation ability, thereby confirming that DNA is the material responsible for heredity.

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