Experiments that led to the discovery of dna
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Experiments that led to the discovery of DNA PowerPoint PPT Presentation


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Experiments that led to the discovery of DNA. Spark notes Edition. Griffith. Experiment : S strain bacteria injected into mouse -> mouse died R strain bacteria injected into mouse -> mouse lived Heated S strain injected into mouse -> mouse lived

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Experiments that led to the discovery of DNA

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Experiments that led to the discovery of dna

Experiments that led to the discovery of DNA

Spark notes Edition


Griffith

Griffith

Experiment:

  • S strain bacteria injected into mouse -> mouse died

  • R strain bacteria injected into mouse -> mouse lived

  • Heated S strain injected into mouse -> mouse lived

  • Heated S (dead) and alive R strain ->mouse died

    Outcome: Cells contain a substance called transforming factor that can change the genome of a host.


Avery

Avery

Experiment:

  • S strain bacteria injected into mouse -> mouse died

  • R strain bacteria injected into mouse -> mouse lived

  • Heated S strain injected into mouse -> mouse lived

  • Heated S (dead) and alive R strain ->mouse died

    Outcome: When the S strain was heated and killed its DNA was incorporated into the R strains DNA and changed the R strain into S strain.

    *Still unknown whether DNA or protein was the “transforming factor”


Hershey chase

Hershey-Chase

Experiment:

Outcome: DNA NOT proteins were the source of genetic material. DNA is the “transforming factor”


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