DNA replication is the process by which DNA makes a copy of itself during cell division. The first step in DNA replication is too 'unzip' the double helix structure of the DNA? molecule.
DNA replication occurs when the DNA strands “unzip,” and the original strands of DNA serve as a template for new nucleotides to join and form a new strand. When does DNA replication occur? DNA replication occurs during the S phase (the Synthesis phase) of the cell cycle, before mitosis and cell division
