Genetics Timeline

Question 0

Thomas Morgan

Answer 0

(1911)-crossbreed white eyed male fly with red eyes female. Only makes in 2nd generation received the white eye trait.
White eyes is a recessive sex-linked trait

Question 1

Gregor Mendel

Answer 1

(1856-1863)
Tracked parental genes in pea plants
The law of segregation, the law of independent assortment, the law of dominance

Question 2

Frederick Griffith

Answer 2

1928–used 2 strains of bacteria in mice

Bacteria can transfer genetic info through transformation

Question 3

Oswald Avery

Answer 3

1944-pure extract of the transforming principle was unaffected by protein digesting enzymes, but was destroyed by DNA digesting enzyme.

A gene is made of DNA, not protein

Question 4

Maurice Wilkins

Answer 4

1950–used X-ray crystallography

DNA is a double helix shaped like a twisted ladder

Question 5

Rosalind Franklin

Answer 5

1951–got high resolution photos of crystallized DNA fibers

Discovered basic dimensions of DNA strands and photophores were on the outside (probs helical structure)

Question 6

Alfred Hershey/ Martha chase

Answer 6

1952-when bacteriophages infect bacteria, DNA enters, but protein does not

DNA is the hereditary material

Question 7

Erwin Chargaff

Answer 7

1952–used paper chromatography to separate DNA

Chargaff’s Rule: A=T, C=G

Question 8

Crick and Watson

Answer 8

1953–built a model of DNA nucleotides

DNA has 2 long strands of monomer nucleotides and is a double helix