Pairing of homologous chromosomes and recombination between them occur in

Options

A. Mitosis
B. Meiosis
C. Amitosis
D. None of these

Answer

To answer the question about where the pairing of homologous chromosomes and recombination between them occurs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process of Cell Division**:
- There are two main types of cell division: mitosis and meiosis. Mitosis is responsible for growth and repair, while meiosis is involved in the formation of gametes.

2. **Identify the Stages of Mitosis**:
- Mitosis consists of several stages (prophase, metaphase, anaphase, and telophase) where chromosomes are duplicated and separated into two identical daughter cells. However, during mitosis, homologous chromosomes do not pair or recombine.

3. **Identify the Stages of Meiosis**:
- Meiosis consists of two rounds of division (meiosis I and meiosis II). In meiosis I, particularly during prophase I, homologous chromosomes pair up in a process known as synapsis.

4. **Recombination in Meiosis**:
- While homologous chromosomes are paired during prophase I of meiosis, they can exchange genetic material through a process called crossing over or recombination. This results in genetic variation in the gametes.

5. **Evaluate Other Options**:
- The question also mentions ermitosis, which is a type of cell division seen in lower organisms and does not involve pairing or recombination of homologous chromosomes.

6. **Conclusion**:
- Since the pairing of homologous chromosomes and recombination occurs during prophase I of meiosis, the correct answer to the question is **meiosis**.

### Final Answer:
The pairing of homologous chromosomes and recombination between them occurs in **meiosis**.

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