Question

What are the 3 stages of cell cycle?

Answer 1

Cell cycle:

1. The cell is the basic structural and functional unit of any living being.
2. It is the fundamental building block, which when combined with similar cells forms a tissue and organs.
3. The cell cycle refers to the series of events that take place in a cell, resulting in the duplication of DNA and division of cytoplasm and organelles to produce two daughter cells.
4. The cell cycle is composed of the interphase, mitotic phase, and G₀ phase.

• Interphase: It is also known as the resting phase of the cell cycle.

1. Interphase is the time during which the cell prepares for division by undergoing both cell growth and DNA replication.
2. It occupies around 95% time of the overall cycle.
3. The interphase is divided into three phases:- the G₁ phase (Gap 1), S phase (Synthesis), and G₂­ phase (Gap 2).

• Mitotic phase: In this, the phase of the equational division as the cell undergoes a complete reorganization to give birth to a progeny that has the same number of chromosomes as the parent cell.

1. The other organelles are also divided equally by the process of cytokinesis which is preceded by mitotic nuclear division.
2. The mitotic phase is divided into four overlapping stages:- Prophase, metaphase, anaphase, and telophase.

• G₀ phase:

1. Some cells like cardiac cells in the adult animals do not exhibit division and some others only divide to replace those cells which have been either damaged or lost due to cell death.
2. These cells which do not divide further attain an inactive G0 phase also known as the quiescent phase after they exit the G₁ phase.