Experiments that led to the discovery of DNA

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Experiments that led to the discovery of DNA Spark notes Edition

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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 - PowerPoint PPT Presentation

Transcript of Experiments that led to the discovery of DNA

Page 1: Experiments that led to the discovery of DNA

Experiments that led to the discovery of DNA

Spark notes Edition

Page 2: Experiments that led to the discovery of DNA

Griffith

Experiment:1. S strain bacteria injected into mouse -> mouse died 2. R strain bacteria injected into mouse -> mouse lived3. Heated S strain injected into mouse -> mouse lived4. 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.

Page 3: Experiments that led to the discovery of DNA

AveryExperiment:1. S strain bacteria injected into mouse -> mouse died 2. R strain bacteria injected into mouse -> mouse lived3. Heated S strain injected into mouse -> mouse lived4. 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”

Page 4: Experiments that led to the discovery of DNA

Hershey-ChaseExperiment:

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

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Page 6: Experiments that led to the discovery of DNA
Page 7: Experiments that led to the discovery of DNA

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