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In 1869 he was the first to identify DNA as a distinct molecule and also isolated nuclein. His paper on nuclein wasn't published until 1871, a guy named Hoppe-Seyler was skeptical of Friedrich work and wanted to confirm before he published it.

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Phoebus Levene was an organic chemist in the early 1900's, he best known for his incorrect hypothesis. He than started tp publish paper about chemical strucutre of sugars.

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They say that Erwin Chargaff’s info "paved the way for the discoveries of DNA’s structure and its method of replication." In which later his observation that varies of DNA speices from one too another where a genctic metarial. Also helped James Watson and Franics Crick of how the bases slotted into double helix. He found that A goes to T and G goes to C.

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Frederick Griffith made a Discovery that could later on be recognized as DNA's History. He was studying 2 diffrent strains of a bacterium which he injected into 2 mice and he observed how the mice would react to what he had injected in the mice.

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Oswald Avery (1944 DNA Experiment ), Macleod and McCarty

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Oswald Avery (1944 DNA Experiment ), Macleod and McCarty

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Oswald Avery and his group showed how DNA was the transforming principle when isolated from one strain of bacteria. DNA was able to transform another strain and replicate it. this shows how DNA would do something called a Semi-Conservative. MaCleod and Mc carty they both where in the trio that found out about the discover of the dexyriobonucleus and. is which also demonstarted that it was not protein that they found but it was in fact DNA.

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In 1951-1952 Hershey and Chase conducted an experiment that verified genes were made of deoxyribonucleic acid or DNA

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Watson and Crick they Proposed the double helix and made the model of it which was how they showed the double helix would look like. It made them get a Nobel Proze in Physiology in 1962 but not only that Rosalind didn't get a prize since she had dead.

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Rosalind she had went to take her X-ray in the crtystallograpgy and was used to capture the famous "photo 15" which help to provide evidience of the structure of the DNA. They also found the double helix DNA as well.

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Wilkins he work with Franklin to interpretation of Rosalind X-ray diffraction images of the DNA, he shared the nodel prize with waston and crick for the discover of the molecular structure of nucleic acids.

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Grego mendel found through his work on pea plants, the discover of the fundametal laws of inheritance.