The movement of homologous chromosomes toward the opposite poles occur by the contraction of spindle fibres during
(a) Anaphase
(b) Anaphase-I
(c) Anaphase-II
(d) Metaphase

Options

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

Answer

To solve the question regarding the movement of homologous chromosomes toward opposite poles during cell division, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Homologous Chromosomes**: These are pairs of chromosomes, one from each parent, that are similar in shape, size, and genetic content.
- **Spindle Fibers**: These are structures that form during cell division to separate chromosomes.

2. **Identify the Phases of Cell Division**:
- **Anaphase**: This is the stage in both mitosis and meiosis where chromosomes are pulled apart.
- **Anaphase I**: This specifically refers to the first meiotic division where homologous chromosomes are separated.
- **Anaphase II**: This is the second meiotic division where sister chromatids are separated.
- **Metaphase**: This is the stage where chromosomes align in the center of the cell, but they are not yet separated.

3. **Focus on Homologous Chromosomes**:
- In meiosis, homologous chromosomes are separated during **Anaphase I**. This is crucial because it is during this phase that the tetrads (pairs of homologous chromosomes) are pulled apart toward opposite poles of the cell.

4. **Analyze the Options**:
- **Option A (Anaphase)**: This is too general and does not specify which type of division.
- **Option B (Anaphase-I)**: This is the correct answer as it specifically refers to the separation of homologous chromosomes.
- **Option C (Anaphase-II)**: This involves the separation of sister chromatids, not homologous chromosomes.
- **Option D (Metaphase)**: This is the stage of alignment, not separation.

5. **Conclusion**:
- The movement of homologous chromosomes toward the opposite poles occurs during **Anaphase-I**. Therefore, the correct answer is **(b) Anaphase-I**.

### Final Answer:
(b) Anaphase-I