Dna replication is called semiconservative because of the original duplex appears in the duplex formed in replication.

HALF.. This is a form of replication where two copies were produced each will contain one of the original strand and the other is a new copy. This happens because each nitrogenous base should pair with the complimentary partner, such as adenine with thymine and cytosine and guanine. DNA replication happens due to the action of enzymes. Each new strands will form an identical copy of the original DNA strand. There are various models proposed to explain how replication occurs. These are the conservative, semiconservative and dispersive.