Terminalisation is completed in diplotene/ diakinesis.

Explanation

To solve the question regarding whether terminalization is completed in diplotene or diakinesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Terminalization**:
- Terminalization refers to the process where chiasmata, which are the points of crossing over between homologous chromosomes, move towards the ends of the chromosomes. This process is crucial during meiosis as it prepares the chromosomes for separation.

2. **Identifying Chiasmata**:
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