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Frederick Griffith
Griffith discovered transformation, which is a change in genotype caused when a cell takes up foreign genetic material. -
Oswald Avery
Avery identified DNA as the transforming principle. -
Erwin Chargaff
Noted the nucleotide composition of DNA waries on the species. -
Rosalind Franklin
Suggested a helical structure that contains 2, 3, or 4 nucleic acid chains. -
Alfred Hershey and Marsha Chase
Labeled the phage DNA with Phosphorus-32. -
James Watson and Francis Crick
Proposing the double helix.
