Answer:
DNA replication.
Step-by-step explanation:
The process by which parent DNA molecule a complete replica (copy) of itself is known as DNA replication. During DNA replication, both the strands of double-stranded DNA get separated and act as template for synthesis of new daughter strands.
The new strands are synthesized by DNA polymerase enzyme that adds nucleotides in growing chain, complementary to parent strand.
Thus, the correct answer is 'DNA replication.'