How did Avery and his group I dentist the transformation principle?

Avery and his group identified the transformation principle through a series of experiments in the 1940s. They utilized heat-killed virulent strains of bacteria and mixed them with live non-virulent strains. The resulting transformation of the non-virulent bacteria into virulent forms indicated that some substance from the heat-killed bacteria was responsible for this genetic change. Their work provided strong evidence that DNA was the carrier of genetic information.