DNA TIMELINE By taryn weddle

In 1866 scientist Gregor Mendel discovered the fundamental laws of inheritance.He deduced that genes come in pairs and are inherited as distinct units, one from each parent

In 1928 scientist Fredrick Griffith discovered the transforming principle in pneumococcus bacteria. reported in 1928 by Frederick Griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation

In 1944 scientist Oswald Avery discovered a gene is made of DNA. Oswald Avery's team proves that DNA, not protein, is the genetic molecule. They repeated Griffith's experiment and discovered that bacteria can transmit genetic information from one generation to the next. The


In 1950 scientist Erwin Chargaff proposed two main rules in his lifetime which were appropriately named Chargaff's rules. The first and best known achievement was to show that in natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units

In 1952 scientist Rosalind Franklin discovered that the DNA molecule is shaped like a twisted ladder. Franklin used took an x-Ray to discover the DNA molecule.

In 1952 the two scientist named Hershey and chase discovered Hershey and Chase concluded that DNA, not protein, was the genetic material. They determined that a protective protein coat was formed around the bacteriophage, but that the internal DNA is what conferred its ability to produce progeny inside a bacterium

Finally in 1962 two scientist named Watson and crick concluded the double helix of DNA instead of having three strands. They look d at the x-Ray that Rosalind Franklin had took in 1952-1953.

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