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Thomas Hunt Morgan and his students at Columbia University,they did a experiment about fly/s eye color. They discovrved that white-eyed is a sex-linked recessive trait. The gene for eye color must be physically located on the X chromosome.
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Frederick Griffith, a scientist, was working on a project in 1928 that formed the basis that DNA was the molecule of inheritance. Griffith's experiment involved mice and two types of pneumonia – one was virulent and the other non-virulent. He injected the virulent pneumonia into a mouse and the mouse died. Next he injected the non-virulent pneumonia into a mouse and the mouse survived.
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In 1929 Phoebus Levene at the Rockefeller Institute identified the components that make up a DNA Molecule.
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Oswald Avery continued with Griffith’s experiment around a decade later to see what the inheritance molecule was. In this experiment he destroyed the lipids, ribonucleic acids, carbohydrates, and proteins of the virulent pneumonia. Transformation still occurred after this. Next he destroyed the deoxyribonucleic acid. Transformation did not occur. He had found the basis of the inheritance.
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Oswald Avery continued with Griffith’s experiment around a decade later to see what the inheritance molecule was. In this experiment he destroyed the lipids, ribonucleic acids, carbohydrates, and proteins of the virulent pneumonia. Transformation still occurred after this. Next he destroyed the deoxyribonucleic acid. Transformation did not occur. He had found the basis of the inheritance.
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In 1953, two scientists, James Watson and Francis Crick, were trying to put together a model of DNA. They took a look at Franklin and Wilkin's picture of the X-ray and made their model.
They created a model that has not been changed much since then. Their model showed a double helix with little rungs connecting the two strands. These rungs were the bases of a nucleotide. -
Sanger discovered the formylmethionine tRNA which initiates protein synthesis.
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The DNA was first used to convict Colin Pitchfork in 1988 in the Enderby murders case in Leicestershire, England. Thus began the journey of DNA research.
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Was an international scientific research project with a primary goal to determine the sequence of chemical base pairs which make up DNA and to identify and map the approximately 20,000–25,000 genes of the human genome from both a physical and functional standpoint
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The cell of Dolly used as the donor for the cloning of Dolly was taken from a mammary gland, and the production of a healthy clone therefore proved that a cell taken from a specific part of the body could recreate a whole individual. On Dolly's name, Wilmut stated "Dolly is derived from a mammary gland cell and we couldn't think of a more impressive pair of glands than Dolly Parton's".