Chromosomes at anaphase are of various shapes depending upon position of centromere. It is J shaped when centromere is

Options

A. metacentric
B. telocentric
C. acrocentric
D. submetacentric

Answer

### Step-by-Step Solution:

1. **Understanding Chromosome Structure**:
- Chromosomes consist of two sister chromatids joined at a central point known as the centromere. The position of the centromere can influence the shape of the chromosome during cell division.

2. **Identifying Phases of Cell Division**:
- During the anaphase stage of cell division, the sister chromatids are pulled apart towards opposite poles of the cell. This separation is facilitated by spindle fibers that attach to the centromere.

3. **Recognizing Chromosome Shapes**:
- The shape of chromosomes during anaphase can vary based on the position of the centromere:
- **Metacentric**: Centromere is located in the middle, resulting in a V shape.
- **Submetacentric**: Centromere is slightly off-center, leading to a J shape.
- **Acrocentric**: Centromere is located near one end, resulting in a rod-like shape.
- **Telocentric**: Centromere is at the very end, leading to a linear shape.

4. **Determining the J Shape**:
- The question specifically asks about the J-shaped chromosome. This shape occurs when the centromere is in the **submetacentric** position.

5. **Conclusion**:
- Therefore, the J-shaped chromosome during anaphase is indicative of a **submetacentric centromere**.