Which chromosomes appear V-shaped in anaphase movement?

Options

A. Telocentric
B. Acrocentric
C. Submetacentric
D. Metacentric

Answer

**Step-by-Step Solution:**

1. **Understanding Anaphase Movement**: In anaphase, the sister chromatids are pulled apart towards opposite poles of the cell. This movement is crucial for ensuring that each daughter cell receives an identical set of chromosomes.

2. **Identifying Chromosome Types**: There are different types of chromosomes based on the position of the centromere:
- **Metacentric Chromosomes**: Centromere is located in the middle, resulting in two equal arms.
- **Sub-Metacentric Chromosomes**: Centromere is slightly off-center, leading to one arm being longer than the other.
- **Acrocentric Chromosomes**: Centromere is located close to one end, creating one very short arm and one long arm.
- **Telocentric Chromosomes**: Centromere is at one end of the chromosome.

3. **Analyzing the V-shape Formation**: During anaphase, the shape of the chromosomes can vary based on their centromere position. Metacentric chromosomes, due to their central centromere, tend to form a V-shape as they are pulled apart. The arms of the chromosome move in opposite directions, creating this characteristic shape.

4. **Evaluating the Options**:
- **Telophase**: This is a stage after anaphase, so it cannot be the answer.
- **Acrocentric**: These do not form a V-shape due to their asymmetrical structure.
- **Sub-Metacentric**: While they may appear somewhat V-shaped, they are not the classic V-shape seen in metacentric chromosomes.
- **Metacentric**: These chromosomes are the ones that appear V-shaped during anaphase due to their centromere being centrally located.

5. **Conclusion**: Based on the analysis, the correct answer is **metacentric chromosomes**.

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