Final answer:
DNA replication that produces double helices with one parental and one newly synthesized strand is indicative of semiconservative replication. This model is supported by experimental evidence and contrasts with the conservative and dispersive models of replication.
Step-by-step explanation:
DNA replication that results in the production of double helices composed of one parental strand and one newly synthesized strand is consistent with semiconservative replication. In this mode of replication, each of the original DNA strands serves as a template upon which a new strand is synthesized. Following replication, each resulting DNA molecule contains one 'old' parental strand and one 'new' synthesized strand. The other two models are conservative replication, where the original DNA molecule is kept intact and the newly synthesized DNA forms a separate molecule, and dispersive replication, where each copy of the DNA would have intermixed segments of old and new DNA. However, it is the semiconservative replication that is supported by the Meselson and Stahl experiment. They concluded that after DNA replication, each double-stranded DNA includes one parental or 'old' strand and one 'newly synthesized' strand.