Answer:
semi conservative replication
Explanation:
Amongst these, in only semi conservative mode of DNA replication one strand will be old i.e. parental while another one will be new in a daughter cell. In semi conservative mode of DNA replication, two daughter DNA double helix are produced and in each one of them one strand is newly synthesized while another one is the parental strand. It this process, parental strands first get separated by the activity of an enzyme named helicase. Each separated parental strand serves as a template for the synthesis of new strands which complement these parental strands. Once the replication gets completed, each daughter cell receives a DNA double helix which comprises one parental and one newly synthesized strand.
