In meiosis disjunction of chromosomes occurs during

Options

A. Metaphase I
B. Anaphase I
C. Metaphase II
D. Anaphase II

Answer

**Step-by-Step Solution:**

1. **Understanding Disjunction of Chromosomes**:
- Disjunction refers to the separation of chromosomes during cell division. In the context of meiosis, it specifically involves the separation of homologous chromosomes or sister chromatids.

2. **Identifying the Phases of Meiosis**:
- Meiosis consists of two main stages: Meiosis I and Meiosis II. Each of these stages has several phases: prophase, metaphase, anaphase, and telophase.

3. **Analyzing Each Option**:
- **Option 1: Metaphase I**:
- During metaphase I, homologous chromosomes align at the equatorial plate. There is no separation occurring at this stage. Therefore, this option is incorrect.

- **Option 2: Anaphase I**:
- Anaphase I is characterized by the separation of homologous chromosomes. The homologous pairs are pulled apart to opposite poles of the cell. This is where disjunction occurs. Thus, this option is correct.

- **Option 3: Metaphase II**:
- In metaphase II, chromosomes align at the metaphase plate again. There is no separation of chromosomes at this stage, making this option incorrect.

- **Option 4: Anaphase II**:
- Anaphase II involves the separation of sister chromatids rather than homologous chromosomes. This means that while there is disjunction, it is not of the homologous chromosomes. Therefore, this option is also incorrect.

4. **Conclusion**:
- After analyzing all options, the correct answer is that disjunction of chromosomes occurs during **Anaphase I** of meiosis.

**Final Answer**: In meiosis, disjunction of chromosomes occurs during **Anaphase I**.

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