Chapter 9.1, Problem 6MI

Summary Introduction

To complete:

The diagram of the cell cycle and describe the main events in each stage.

Introduction:

The cell cycle is the ordered sequence of events that occur in a cell when a cell prepares for its division. The cell cycle is a four-stage process.  The cell cycle consists of interphase, followed by mitosis and cytokinesis phase. Interphase includes gap1 (G₁), synthesis (S-phase) and gap 2 (G₂) phase.

Answer to Problem 6MI

  

The sequence of events in the cell cycle is given below:

S. No.	Event
1	Mitosis
2	Cytokinesis
3	G1 or Gap 1
4	S phase or synthesis
5	G2 or Gap 2

Explanation of Solution

1. Mitotic division or karyokinesis: It is further divided into sub-phases such as prophase, metaphase, anaphase and telophase. Nucleus and chromosomes divide into two sets.
2. Cytokinesis: After karyokinesis, cytoplasm divides to from two daughter cells.
3. G₁ phase: This is also called Gap1 phase. During this phase, cells makes protein and its size increases.
4. S phase: This is also called synthesis phase during which replication of DNA takes place.
5. G₂ phase: This is also called Gap 2 phase. Cell continues to grow in this phase and later the cell gets ready for its division.