History of Genetics: Summary of Timeline Flashcards

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1
Q

Darwin

A
  • Published The Origin of Species
  • Strengthened the adaptation hypothesis
  • Survival of the fittest theory
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2
Q

Gregory Mendel

A
  • Law of independent assortment and Law of Segregation
  • Traits are carried by discrete units (genes)
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3
Q

Walter Fleming

A
  • He stained cells and discovered rod-shaped bodies
  • Later called chromosomes
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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
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5
Q

Erwin Chargaff

A
  • Nucleic acids are composed of fixed ratios of subunits
  • # G=#C
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6
Q

Alfred Hershey and Martha Chase

A

DNA rather than proteins carries genetic information

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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
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8
Q

Matthew Meselson and Franklin Stahl

A
  • Proved that DNA replicated semiconservatively
  • Double strands uncoil one strand at a time
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