Chromosomal movement in Anaphase occurs with the help of :-

Options

A. Astral rays
B. Centrioles
C. NOR
D. Spindle fibres

Answer

To answer the question "Chromosomal movement in Anaphase occurs with the help of:", we will analyze the options provided and understand the role of each component during the anaphase stage of cell division.

### Step-by-Step Solution:

1. **Understanding Anaphase**:
- Anaphase is a stage in both mitosis and meiosis where the sister chromatids (or homologous chromosomes in meiosis) are separated and moved towards opposite poles of the cell.

2. **Identifying Key Components**:
- The primary components involved in the movement of chromosomes during anaphase are:
- **Spindle Fibers**: These are structures that form during cell division and are crucial for the movement of chromosomes.
- **Centrioles**: These are involved in the formation of spindle fibers but do not directly cause the movement of chromosomes.
- **Astral Rays**: These help in positioning the spindle apparatus but are not directly responsible for the movement of chromosomes.

3. **Role of Spindle Fibers**:
- During anaphase, spindle fibers attach to the kinetochores of the chromosomes. The fibers shorten, pulling the sister chromatids apart and toward opposite poles of the cell.

4. **Conclusion**:
- Based on the analysis, the correct answer to the question is that chromosomal movement in anaphase occurs with the help of **spindle fibers**.

### Final Answer:
The correct option is **spindle fibers**.

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