Answer:
Alfred Hershey and Margaret Chase confirmed that DNA is a genetic material.
Step-by-step explanation:
Many scientists did not believe that the DNA molecule was responsible for genetic inheritance since it was not sufficiently complex.
Alfred Hershey and Martha Chase's experiments with the Escherichia coli infecting bacteriophage T2 confirmed that DNA is a genetic material.
They began the experiments by knowing at first the form and mechanism by which the phage injected its material into bacterial cells. By injecting it, the phage body releases from the cell surface, so the injected material should be the hereditary material. They also knew that the only chemical components in a phage are proteins and DNA. They then tested whether the hereditary material was DNA or protein and came to the conclusion we know today.