Question

The decision for cell division is taken
A. Before the start of prophase
B. G1 phase
C. S phase
D. G2 phase

Answer 1

Cell division can be defined as the process by which a parent cell of animal or plants divides into two or more daughter cells and carry the information from one generation to the next generation.

Complete answer: The cell cycle has mainly two phases –
1. Interphase and
2. Mitotic phase.
The Interphase has three parts – G1, S, and G2.
1. The mitotic phase is divided into prophase, metaphase, anaphase, and telophase.
2. G1 is the first phase of the cell cycle where cell growth takes place and the decision is made whether the cell will undergo the cycle or not. This is a phase between the end of a cell cycle and the synthetic phase of the next cell cycle.
3. In the S phase, synthesis occurs. This step is also called the synthetic phase.
This is the immediate next step of G1. In this phase DNA replication take place.
4. The final stage of interphase is the G2 phase. It is also the start of prophase.
In this phase, final cell growth occurs.
5. So, we can say that the decision for the cell cycle is taken in option B. G1 phase.

Hence, the correct answer is option B.G1 phase.

Note: There is a presence of G0 stage in the middle of G1 phase, where cell takes rest. This is also called the resting stage.
The neuron is the only cell in the body that is in the G0 phase.