Final answer:
In DNA replication, there are three different models for how the parental and newly formed strands are organized: conservative, semi-conservative, and dispersive. In conservative replication, the parental DNA remains together, while in semi-conservative replication, each parental strand acts as a template for new DNA synthesis. The dispersive model suggests that segments of both parental and newly synthesized DNA are present in each copy of DNA.
Step-by-step explanation:
In DNA replication, there are three different models that describe how the parental and newly formed strands are organized. In conservative replication, the parental DNA remains together, and the newly formed daughter strands are together. On the other hand, in semi-conservative replication, each of the two parental DNA strands acts as a template for new DNA to be synthesized, resulting in each double-stranded DNA molecule consisting of one parental or 'old' strand and one 'new' strand. This was supported by the Meselson and Stahl experiment. In the dispersive model, both copies of DNA have segments of parental DNA and newly synthesized DNA interspersed.