Chapter 9

Chapter 9 - Chapter 9-DNA The Molecule of Heredity I How...

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Chapter 9—DNA:  The Molecule of Heredity I. How did scientists discover that genes are made of DNA? a. Introduction i. DNA is the molecule that carries the blueprints for all forms of life on  Earth 1. The “molecular interactions” in DNA direct the life of each cell in  an organism 2. Also enables organisms to transmit info accurately from one  generation to the next ii. Discovery of how DNA works was one of the greatest achievements of  20 th  century biology b. Transformed bacteria revealed the link between genes and DNA i. Frederick Griffith did experiments with 2 strains of  Streptococcus  pneumonia  bacterium in mice 1. Although he never found a vaccine, his experiments marked a  turning point in understanding of genetics because other  researchers suspected that the substance that causes  transformation might be the long-sought molecule of heredity ii. Oswald Avery, Colin MacLeod, and Maclyn McCarty of Rockefeller  University purified the molecule from the S-strain bacteria that could  transform the R-strain into the S-strain 1. This was DNA 
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This note was uploaded on 04/09/2008 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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Chapter 9 - Chapter 9-DNA The Molecule of Heredity I How...

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