Answer:
DNA replication is called semiconservative because the new DNA helices are formed by a new strand and an old strand, commonly called daughter strand and mother strand.
Explanation:
This happens as the DNA is replicated from the replication fork by the DNA-polymerase, using the old strands as templates to create the new strand with its complementary bases. This results on two double helices formed by an old and a new strand. This was proved by the experiment of Meselson and Stahl.
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