2. Our understanding of DNA
2
1869
• Discovery of DNA
• F. Miescher
1883
• Chemical basis of
inherited traits
• A. Weismann & K.
Nageli
late 1920s
• "Transformation
Principle"
• F. Griffith
1944
• DNA is the
Genetic Material
• Avery, MacCleod,
McCarty
1950
• DNA really is the
Genetic Material
• Hershey and
Chase
1950
• In DNA samples,
equal quantities
of Adenine and
Thymine while
Guanine equal to
Cytosine
• E. Chargaff
1952
• Photo 51
• R. Franklin
1953
• Double Helix!
• J. Watson & F.
Crick
A=T
C=G
*The only names and dates you have to remember are Franklin, Crick, and
Watson and the year 1953.