1. The History of DNA

2. Gregor Mendel
1865
9/21/2018

3. Frederick Miescher 1844- 1895 Embryologist
He collected bandages from nearby clinic
And wash off the pus.
Isolated a new molecule NUCLEIN
from the cells nucleus in 1869.
H,N, P, and O
1871 He publish his findings.
Proteins were the molecule of heredity
Die of tuberculosis in 1895.

4. FREDRICK GRIFFITH
1928
9/21/2018

5.
9/21/2018

6. COLIN MACLEOD OSWALD AVERY 1944 MACLYN McCARTY
Profiles.nlm.nih.gov/CC/Views/Exhibit/visuals/after.html
Avery Experiment
MACLYN McCARTY
9/21/2018

7. LINUS PAULING
1948
He proposed that the DNA structure was a triple helix, though he was later disproven.
The fact that he determined DNA to be three dimensional is still a much celebrated accomplishment
9/21/2018

8. ERWIN CHARGAFF
1950
Chargaff's observation that in the base composition of DNA the quantity of adenine equaled the quantity of thymine and the quantity of guanine equaled the quantity of cytosine
A = T
C = G
9/21/2018

9. Drosophila melanogaster
Organisms  A T G C
Homo sapiens 31
31.5
19.1
18.4
Drosophila melanogaster
27.3
27.6
22.5
Zea mays
25.6
25.3
24.5
24.6
Neurospora crassa 23
23.3
27.1
26.6
Escherichia coli
24.3
25.5
Bacillus subtilis
28.4 29 21
21.6
Data collected from From “Biology” by Mader (10th Ed) pg 214
9/21/2018

10. ROSALIND FRANKLIN 1951 MAURICE WILKINS
MAURICE WILKINS
9/21/2018

11. Rosalind Franklin English Biologist Made and X-ray of DNA.
She was an instrument in discovering the
structure of DNA.
Also Known as the Dark Lady of the DNA
X-ray diffraction specialist.
X-Ray 51
Die in 1958 at age of 37 of ovarian cancer.

12. X-Ray 51
9/21/2018

13. 1952 MARTHA CHASE ALFRED HERSHEY
9/21/2018

14. 9/21/2018

15. FRANCIS CRICK AND JAMES WATSON
1953
9/21/2018

16. 9/21/2018

17. Noble Price 1962
9/21/2018

18.
9/21/2018

19. 9/21/2018

20.
9/21/2018