cara4830
春芽
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DNA as the genetic material should have two basic functions,first,to see the era of genetic information transfer,thus ensuring the continuation of species and genetic stability,and second,in the cell and individual growth and development of such processes can be expressed,thus demonstrating similar to the parental traits.Must be accurate,DNA replication.In 1953 Watson and Crick proposed model and the DNA double helix structure of DNA semi-conservative model.In 1958,the first by Meselson and Stahl E.coli as the material,the use of N15 and N14 with the bits labeled DNA test confirmed the correctness of semi-conservative replication model.
After Cairns in 1963 of E.coli DNA autoradiography experiments,and Taylor in 1958,carried out in broad bean chromosome autoradiography experiments,were indicative of eukaryotic and prokaryotic like,DNA replication methods are carried out by semi-conservative manner.
1年前
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