Sequentially the last stage to occur among the following is :

Options

A. Diakinesis
B. Pachytene
C. Zygotene
D. Leptotene

Answer

To solve the question regarding the sequential order of stages in meiosis, we will analyze the stages of prophase I in meiosis and identify which stage occurs last among the given options.

### Step-by-Step Solution:

1. **Identify the Stages of Prophase I**:
Prophase I of meiosis is divided into five distinct stages:
- Leptotene
- Zygotene
- Pachytene
- Diplotene
- Diakinesis

2. **Understand Each Stage**:
- **Leptotene**: This is the first stage where the chromosomes start to condense.
- **Zygotene**: In this stage, homologous chromosomes begin to pair up, forming a synaptonemal complex.
- **Pachytene**: This is the stage where crossing over occurs, leading to genetic recombination.
- **Diplotene**: Here, the homologous chromosomes begin to separate but remain connected at points called chiasmata.
- **Diakinesis**: This is the final stage of prophase I where further chromatin condensation occurs, and the spindle fibers begin to form.

3. **Determine the Last Stage**:
The question asks for the last stage to occur among the options provided: diakinesis, pachytene, zygotene, and leptotene.
- Since diakinesis is the final stage of prophase I, it is the last stage to occur.

4. **Conclusion**:
Therefore, the correct answer to the question is **diakinesis**.

### Final Answer:
**Diakinesis** is the last stage to occur among the options given.

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