3.1 - History of DNA discoveries (search for inheritable material)

Question 1

Who prefromed the experiment with smooth and rough strains of bactiera on mice?
When was it preformed?

Answer 1

Griffin
1856-1863

Refer to diagram in 3.1 notes

Question 2

Who preformed experiments on pea plants to discover inherable material? What “law” did he discover?
When?

Answer 2

Gregor Mendel discovered the law of inheritance
1856-1863

Question 3

What experiment did Hammerling preform?
When?

Answer 3

• experiments on unicelluar alge
• switched out the nucleus in the “foot” of the plant and found that the new growth’s characteristics were based on the nucleus
• occured in 1930

Question 4

What did scientists Hershey and Chase discover in 1952?

Answer 4

Their experiments proved that viruses injected in nucleic acids instead of protiens, meaning inheritable material came from the nucleus and not proteins as it was theorized

Question 5

Who published the first structure of DNA and when? What is the controversy behind it?

Answer 5

• Watson and Crick in 1953
• It was actually Rosalind Fraklin, using the lab of Maurice Wilkiens, who used x-ray crystallography to take photos of DNA molecues and discovered the double helix shape.
• Watson was visiting the image and was able to read these images. Rosalind did not get credit

Question 6

What is Chargaff’s Rule and who discovered it?

Answer 6

Erwin found that there were equal amounts of base pairs in DNA, and only certian bases paired with eachother.
ie: A & T, and C & G