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Biology Genetics Chapter 12 Section 1: Identifying the Substance of Genes Name: [9] SC1.1 recognizing that all organisms have chromosomes made of DNA and that DNA determines traits [11] SC1.1 relating the structures of DNA to characteristics of an organism Vocabulary: Define the following in your own words. Transformation: Bacteriaphage: KEY CONCEPTS 1. Read the section on Griffith’s Experiments and Transformations. Write a short summary of the experiment. (10 points) 2. How did Oswald Avery determine that DNA was responsible for transforming the harmless bacteria in Griffith’s experiment? 3. What evidence was there from the Hershey – Chase Experiment that DNA was the genetic material that infected the bacteria? 4. What are the three main roles of DNA in heredity?