Timelinedna

Páginas: 2 (286 palabras) Publicado: 27 de septiembre de 2012
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Name: _________________________________________________ Grade: _________DNA TIMELINE

During the history of Biology, many scientists tried to understand the way that living things evolved, inherited their traits and produced offspring. They were wondering why theoffspring kept similarities with their parents.

In 1866, Gregor Mendel experimented with pea plants to observe the way that traits were passed from one generation to another. He establishedthe laws of heredity and is known as the Father of Genetics.

In 1868, Friedrich Miescher extracted DNA from pus cell nuclei, discovering the nucleic acids.

In 1900, Mendel’s work isrediscovered and reevaluated.

In 1903, Walter Sutton and Theodor Boveri developed the chromosome theory.

In 1910, Thomas Morgan, verified Sutton’s work with fruit fly experiments.

1n 1914, RobertFeulgen found a way to reveal DNA with fuchsine in eukaryotic cells.

During the decade of the 20’s, P.A. Levene, analyzed the components of DNA establishing that it was composed by deoxyribose, aphosphate group and the four nitrogen bases, adenine, cytosine, thymine and guanine.

In 1928, Frederick Griffith explored genetic material with mouse experiments. He introduced the word “gene.”In 1944, Oswald Avery indicated that DNA was most likely the genetic material.

In 1952, Edwin Chargaff determined the rules that govern the proportion of DNA bases. During the same year,Rosalind Franklin photographed DNA by using X-ray crystallography with her colleague Maurice Wilkins. Later in the same year, Martha Chase and Alfred Hershey confirmed that DNA kept the geneticmaterial.

In 1953, based on ms. Franklin’s work, James Watson and Francis Crick, modeled DNA.

Taken from www.biologia.edu.ar/adn/adntema0.htm and Biology the Web of Life by Strauss and Lisowski
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