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Gregor mendel
shows that the characteristics of pea plants are passed along a predictable way.

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Walter Sutton
Shows that chromosomes carry the cell units of inheritance

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Thomas Hunt Morgan
Demonstrates that ganes are arranged in linear fashion on the chromosomes of the fruit fly

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Frederick Griffith
Discovers that bacteria contain a molecule that can be transfer genetic information from cell to cell

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Oswald Avery
Show the substance that griffith discovered

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Erwin Chargaff
Analyzes the base composition of DNA in cells He discovers that the amounts of the adenine of thyme are almost always equal

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Alfred Hershey and Martha chase
conform that the genetic material of viruses is DNA, not protein

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Craig Venter and Francis Collins
Announces the draft DNA sequence of the human genome at the white house ceremonu in washington D.C