Biotechnology and Bioinformatics (1+1)

1.4.7. Types of replication

Three models of DNA replication were proposed:

1. Semi conservative replication would produce two copies that each contained one of the original strands and one new strand. Semi conservative replication describes the method by which DNA is replicated in all known cells.

2. Conservative replication would leave the two original template DNA strands together in a double helix and would produce a copy composed of two new strands containing all of the new DNA base pairs.

3. Dispersive replication would produce two copies of the DNA , both containing distinct regions of DNA composed of either both original strands or both new strands.

The deciphering of the structure of DNA by Watson and Crick in 1953 suggested that each strand of the double helix would serve as a template for synthesis of a new strand. However, there was no way of knowing how the newly synthesized strands might combine with the template strands to form two double helical DNA molecules.

The semiconservative model seemed most reasonable since it would allow each daughter strand to remain associated with its template strand. The semiconservative model was confirmed by the Meselson-Stahl experiment .