DNA Replication is said to be semiconservative because when replication takes place, one of the original strands of DNA is conserved in every replica.
How is this semiconservative?
When DNA replication takes place, the double helix structure of the DNA molecule is broken. It is separated into two single DNA strands, each of these is then duplicated to create two new double helix strands, thus preserving one strand from the parent sample in each replication.
Therefore, due to the fact that each duplicated strand of DNA retains one of the original parent strands, it is said that the process is semiconservative.
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