Final answer:
The conservative model held that the two parental strands would remain associated after replication.
Step-by-step explanation:
The model that held that the two parental strands would remain associated after replication is the conservative model.
In conservative replication, the parental DNA remains together, and the newly formed daughter strands are together. Each double-stranded DNA molecule includes one parental or "old" strand and one "new" strand.
The Meselson and Stahl experiment supported the semiconservative model of replication, in which each parental DNA strand acts as a template for new DNA synthesis. After replication, each double-stranded DNA molecule consists of one parental strand and one newly synthesized strand. Meselson and Stahl's experiment, however, provided evidence in support of the semiconservative model, where each parental strand serves as a template for a new complementary strand, leading to two new DNA molecules, each with one parental and one newly synthesized strand.