S Phase

Definition

The S phase, or synthesis phase, is a part of the cell cycle where DNA replication occurs. During this phase, each chromosome is duplicated to ensure that both new cells will have complete sets of chromosomes.

Related terms

DNA Replication:

This is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.

Chromosome: A structure within cells that contains genetic material. Each chromosome carries many genes.

Cell Cycle:

The sequence of growth and division that cells undergo. It includes interphase (G1, S, G2), mitosis and cytokinesis.