Chromosomes appearing rod shaped during anaphase are

Options

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

Answer

To answer the question about the shape of chromosomes during anaphase, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the shape of chromosomes during anaphase, specifically which type appears rod-shaped.

2. **Identify the Types of Chromosomes**: The options provided are:
- Acrocentric
- Metacentric
- Submetacentric
- Telocentric

3. **Define Each Type of Chromosome**:
- **Acrocentric**: The centromere is located near one end of the chromosome, resulting in one long arm and one short arm.
- **Metacentric**: The centromere is located in the middle, resulting in two arms of equal length. These chromosomes typically appear X-shaped during metaphase and can appear V-shaped during anaphase.
- **Submetacentric**: The centromere is slightly off-center, leading to two arms of unequal lengths. They can appear L-shaped during anaphase.
- **Telocentric**: The centromere is located at one end of the chromosome, making the chromosome appear rod-shaped or similar to the letter "I".

4. **Analyze the Shape During Anaphase**: During anaphase, chromosomes are pulled apart. The telocentric chromosomes, due to their centromere being at one end, appear as rod-shaped structures.

5. **Conclusion**: Based on the definitions and shapes of the chromosomes, the correct answer to the question is **telocentric chromosomes**.

### Final Answer:
The chromosomes appearing rod-shaped during anaphase are **telocentric chromosomes**.