Final answer:
The semi-conservative model of DNA replication suggests that newly synthesized strands of DNA have a mixture of parental and newly synthesized strands.
Step-by-step explanation:
The model of DNA replication that suggests newly synthesized strands of DNA have mixtures of parental and newly synthesized strands is the semi-conservative model. According to this model, each of the two parental DNA strands acts as a template for new DNA to be synthesized. After replication, each double-stranded DNA includes one parental or "old" strand and one "new" strand.