Find out the correct sequence of events during meiosis
(I) Disjunction (II) Crossing over (III) Synapsis (IV) Terminalisation

Options

A. III,II,I,IV
B. III,II,IV,I
C. II,III,I,IV
D. III,IV,II,II

Answer

To find the correct sequence of events during meiosis from the options provided (I) Disjunction (II) Crossing over (III) Synapsis (IV) Terminalisation, we need to understand the stages of meiosis and the order in which these events occur.

### Step-by-step Solution:

1. **Identify the stages of meiosis**:
- Meiosis consists of two main stages: Meiosis I and Meiosis II. Within Meiosis I, there are several phases: Prophase I, Metaphase I, Anaphase I, and Telophase I.

2. **Understand the events**:
- **Synapsis (III)**: This is the pairing of homologous chromosomes that occurs during Prophase I of meiosis. It is the first step where homologous chromosomes come together.
- **Crossing over (II)**: This occurs during the Pachytene stage of Prophase I, where segments of DNA are exchanged between homologous chromosomes, increasing genetic diversity.
- **Terminalisation (IV)**: This refers to the movement of chiasmata (the points where crossing over has occurred) to the ends of the chromosomes, which happens towards the end of Prophase I.
- **Disjunction (I)**: This occurs during Anaphase I, where the homologous chromosomes are pulled apart to opposite poles of the cell.

3. **Sequence the events**:
- The correct order of these events during meiosis is:
1. **Synapsis (III)**: Homologous chromosomes pair up.
2. **Crossing over (II)**: Genetic material is exchanged between homologous chromosomes.
3. **Terminalisation (IV)**: Chiasmata move to the ends of the chromosomes.
4. **Disjunction (I)**: Homologous chromosomes are separated and pulled to opposite poles.

4. **Final Sequence**: Therefore, the correct sequence of events during meiosis is:
- (III) Synapsis → (II) Crossing over → (IV) Terminalisation → (I) Disjunction.

### Conclusion:
The correct sequence of events during meiosis is **III → II → IV → I**.