History of Genetics: Summary of Timeline Flashcards
1
Q
Darwin
A
- Published The Origin of Species
- Strengthened the adaptation hypothesis
- Survival of the fittest theory
2
Q
Gregory Mendel
A
- Law of independent assortment and Law of Segregation
- Traits are carried by discrete units (genes)
3
Q
Walter Fleming
A
- He stained cells and discovered rod-shaped bodies
- Later called chromosomes
4
Q
Frederick Griffith
A
- Infections are reduced when bacterial cells are heated but if they are exposed to other DNA again the infection can reoccur
- Discovered the Transforming Principle
5
Q
Erwin Chargaff
A
- Nucleic acids are composed of fixed ratios of subunits
- # G=#C
6
Q
Alfred Hershey and Martha Chase
A
DNA rather than proteins carries genetic information
7
Q
Watson and Crick
A
- DNA is a double-strand helix of nucleotides
- Determined A,T,C,G and nucleotides are joined together by covalent bonds
- DNA replication is possible
8
Q
Matthew Meselson and Franklin Stahl
A
- Proved that DNA replicated semiconservatively
- Double strands uncoil one strand at a time
