Interphase

Definition

Interphase is the phase of the cell cycle during which the cell prepares for division by growing and replicating its DNA. It consists of three sub-phases: G1, S, and G2.

5 Must Know Facts For Your Next Test

1. Interphase occupies about 90% of the cell cycle.
2. G1 phase involves cell growth and the synthesis of proteins necessary for DNA replication.
3. S phase is characterized by the replication of DNA, resulting in two sister chromatids for each chromosome.
4. G2 phase involves further cell growth and preparation for mitosis, including the production of microtubules.
5. Cells that are not actively dividing may enter a resting state called G0 from G1.

Review Questions

• What are the three sub-phases of interphase?
• During which sub-phase does DNA replication occur?
• Explain what happens during the G2 phase of interphase.

Related terms

Mitosis: The process where a single cell divides to produce two identical daughter cells.

Cell Cycle:

The series of events that take place in a cell leading to its division and duplication.

G0 Phase: A resting state where cells exit the active cycle and do not prepare for division.