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Name: ____________________________________________________
PD ______
The History of DNA’s Discovery PowerPoint Project
Objective:
Create a timeline revealing the discovery of DNA as the hereditary material and its helical structure.
Guidelines:
Your timeline must include the following scientists:
Griffith, Avery, Hershey & Chase, Watson & Crick, Chargaff and Wilkin’s and Franklin.
You must include the following information for each:
Picture, names, timeframe, experimental process and findings, major contributions to discovery of
DNA as hereditary material
Your slideshow should be in chronological order. Use the hints below to ensure that your presentation is
complete. GOOD LUCK!
HINTS
GRIFFITH
Who was he (full name)? Where was he from?
What was he trying to do?
Describe the two types of bacteria he worked with.
What happened when the smooth and rough bacteria were injected into mice?
Summarize Griffith’s four different experiments.
What did he conclude from his work?
What is transformation?
Avery
Who was he (full name)? Where was he from?
What did he want to figure out about transformation?
Describe Avery’s experiments.
What conclusion did Avery come to?
Was Avery trying to discover that DNA is the active agent of genetic transformation?
What did he discover?
Hershey – Chase
Who were they (full names)? Where were they from? When did they do their work?
What were these scientists investigating?
What is a bacteriophage?
What is a radioactive isotope?
Describe how these scientists labeled DNA and proteins to determine which was the molecule of heredity.
What did these scientists conclude?
Chargaff
Who was he (full name)? Where was he from? When did he do his work?
Define nucleotide. List the four types of nucleotides.
What did he find interesting about the amount of nucleotides in DNA samples?
What are Chargaff’s rules?
How did he help Watson and Crick?
Franklin
Who was she (full name)? Where was she from? When did she do her work?
Describe x-ray diffraction.
What impact did her work have on solving the DNA structure mystery?
Why do some say she was “cheated” out of the credit she deserved?
Watson and Crick
Who were these scientists? When did they do their work? Where?
Describe the model they proposed for the structure of DNA.
What information helped them create the helix model?
What held the DNA helix together?
Describe how Crick felt about Watson, especially after their discovery.