Phase

Definition

A phase is a distinct period or stage in the process of cell division. Each phase plays a crucial role in ensuring accurate replication and distribution of genetic material.

5 Must Know Facts For Your Next Test

1. The cell cycle consists of four main phases: G1, S, G2, and M.
2. During the G1 phase, the cell grows and synthesizes proteins necessary for DNA replication.
3. The S phase is where DNA replication occurs, resulting in two sister chromatids for each chromosome.
4. In the G2 phase, the cell continues to grow and prepares for mitosis by producing necessary organelles and molecules.
5. The M phase includes both mitosis (nuclear division) and cytokinesis (cytoplasmic division), resulting in two daughter cells.

Review Questions

• What happens during the S phase of the cell cycle?
• How does the G2 phase prepare a cell for mitosis?
• Why is accurate progression through each phase important for cellular reproduction?

Related terms

Mitosis: A process of nuclear division resulting in two genetically identical daughter cells.

Cytokinesis:

The division of the cytoplasm to form two separate daughter cells after mitosis.

Chromatid: One half of a duplicated chromosome, which pairs with its sister chromatid during cell division.