The experiments of Griffin and Avery proved that DNA of heat-killed S strain bacteria was responsible for developing pneumonia in mouses that were infected with heat-killed S and live R strain bacteria. They concluded that DNA of the S strain bacteria was passed on the next generation, which was able to infect lungs.

Hershey and Chase wanted to find out which part of the bacteriophage will enter the bacteria and pass on genetic material – protein or DNA. The proteins were marked with radioactive sulfur-35, while DNA contained radioactive phosphorus-32. At the end of this experiment, they found phosphorus-32 in the bacteria, which supports Avery’s theory that genes are located in the DNA of the cell.

Three roles of the DNA molecule in heritage are in storage, copying and transmitting genes. Every cell contains DNA, where is the complete genetic material stored. It must be doubled during the cell division and then passed on the daughter cells.

Hershey and Chase wanted to find out which part of the bacteriophage will enter the bacteria and pass on genetic material – protein coat or DNA core. The proteins were labeled with radioactive sulfur-35, while DNA contained radioactive phosphorus-32. When they joined labeled viruses and bacteria, they discovered that phosphorus-32 was present in the bacteria. This outcome supported Avery’s theory that genes are located in the DNA of the cell.

Avery’s team proved in 1944 that DNA contain genetic material. They concluded that DNA of the heat-killed S strain, when mixed with R strain bacteria, was passed on the next generation, which was able to induce pneumonia. They made a conclusion based on the fact that mice didn’t develop pneumonia if the DNA of the heat-killed S bacteria was previously resolved. In 1952, Hershey and Chase wanted to find out which part of the bacteriophage will enter the bacteria and pass on genetic material – protein coat or DNA core. The proteins were labeled with radioactive sulfur-35, while DNA contained radioactive phosphorus-32. When they joined labeled viruses and bacteria, they discovered that phosphorus-32 was present in the bacteria. This outcome supported Avery’s theory that genes are located in the DNA of the cell.