Class 12 Biology Molecular Basis of Inheritance Hershey-Chase Experiment

Hershey-Chase Experiment

Hershey-Chase experiment was performed in 1952 to further confirm that DNA was the genetic material. They experimented with Bacteriophages. Bacteriophages are the viruses that infect & replicate within bacteria.

Class_12_Molecular_Basis_Of_Inheritance_Bacteriophages

Bacteriophages were grown in two different mediums.

  • Some bacteriophages were grown in radioactive phosphorus medium. It was found that these Bacteriophages came up with radioactive DNA
  • Some bacteriophages were grown in radioactive sulfur medium. It was found that these Bacteriophages with radioactive protein.

 Class_12_Molecular_Basis_Of_Inheritance_RadioactiveDNA_&_RadioactiveProtein

  1. Bacteriophages with Radioactive DNA were brought in contact with bacteria
  2. Bacteria got infected
  3. Agitated in a blender to separate phage particles from bacterial cells
  4. Centrifugation leaves Phage particles as supernatant
  5. Bacterial cells were found to be radioactive
  6. No radioactivity was detected in the phage particles

 

  1. Bacteriophages with Radioactive protein were brought in contact with bacteria
  2. Bacteria got infected
  3. Agitated in a blender to separate phage particles from bacterial cells
  4. Centrifugation leaves Phage particles as supernatant
  5. Phage particles were found to be radioactive
  6. No radioactivity was detected in the bacterial cells

It was therefore concluded that it was not the proteins, rather DNA which entered into the bacteria. Therefore, DNA causes the replication of viruses inside the bacteria.

DNA was thus proved to be the genetic material.

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