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1866
Pea Plants
- Breed pea plants of different colors and found that there is a dominant and recessive gene.

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1928
Bacteria and Mice
- Injected mice with a bacteria that causes pneumonia. One was surrounded by a coating made of carbohydrates. The other was not. He tried it on four different mouses. Two lived and the other two died.

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1929
Bases
- Identified the nitrogenous bases for DNA and RNA.
(Guanine, Adenine, Thymine and Cytosine)

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1950
Relationship between Bases
- Found that the nitrogenous bases fit together like a puzzle. Adenine with Thymine and Guanine with Cytosine.

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1952
Bacteriophage
- They tagged a bacteriophage with sulfur. They used a blender and centrifuge to separate the bacteria and phage. When examined, they found no significant radioactivity. They repeated the same process but they tagged the DNA with phosphorus. This time, radioactivity was present.

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1952
X-Ray
- Using x-ray crystallography found X surrounded by a circle. The pattern s and angles of the X suggested that DNA is a helix consisting of two strands that are regular, consistent width apart.

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1953
DNA Model
- They found if they paired double-ringed nucleotides with single- ringed nucleotides, the bases fit like a puzzle.The model showed that two strands of DNA wind around each other like a twisted ladder.