![]() There were two competing models also suggested: conservative and dispersive, which are shown in Figure 9.1.įigure 9.1 Three Models of DNA replication. After replication in this model, each double-stranded DNA includes one parental or “old” strand and one daughter or “new” strand. In one model, semiconservative replication, the two strands of the double helix separate during DNA replication, and each strand serves as a template from which the new complementary strand is copied. Separating the strands of the double helix would provide two templates for the synthesis of new complementary strands, but exactly how new DNA molecules were constructed was still unclear. The elucidation of the structure of the double helix by James Watson and Francis Crick in 1953 provided a hint as to how DNA is copied during the process of DNA replication.
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