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Oswald Avery, an early molecular biologist and immunochemist, is best known for his discovery in 1944 (with his co-workers Colin MacLeod and Maclyn McCarty) that DNA is the material of which genes and chromosomes are made.

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10y ago
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9y ago

Oswald Theodore Avery (1877-1955) was a Canadian-born bacteriologist, research physician, and one of the founders of immunochemistry. He is best known for his discovery that deoxyribonucleic acid (DNA) serves as genetic material. His work helped create a platform for modern DNA research.

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14y ago
Oswald Avery in DNAOswald Avery proved that DNA was the genetic material in organisms. He began his investigation after Griffith's experiment with transformation of DNA in mice. Griffith exploited how non-pathogenic bacteria had the ability to transform into pathogenic bacteria by the presence of dead pathogenic bacteria.

Avery took qualitative tests for protein in a sample of the transforming agent and the test came back negative, meaning the presence of the unknown genetic material does not exist. However, the qualitative test for DNA came back positive, confirming the genetic material's presence. Avery further proved his discovery by analyzing the chemical components of the genetic material, finding that the phosphorous-nitrogen ratio was closely similar to that of DNA.

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15y ago

Avery is attributed with the discovery that the material in which the genetic information is encoded is DNA and not protein or carbohydrate.

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Q: What was the contribution of Oswald Avery to modern genetics?
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