In which chromosome the centromere is situated close to its end forming one extremely short and one very long arm -

Options

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

Answer

To determine which chromosome has a centromere situated close to its end, forming one extremely short arm and one very long arm, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Chromosome Structure**:
- Chromosomes consist of two arms divided by a centromere. The position of the centromere can vary, leading to different classifications of chromosomes.

2. **Identify Chromosome Classifications**:
- **Metacentric Chromosomes**: Centromere is located in the center, resulting in two equal arms.
- **Submetacentric Chromosomes**: Centromere is slightly off-center, resulting in two unequal arms, but not extremely different in length.
- **Telocentric Chromosomes**: Centromere is located at one end, resulting in one long arm and one very short arm (the short arm is often not visible).
- **Acrocentric Chromosomes**: Centromere is located very close to one end, resulting in one extremely short arm and one very long arm.

3. **Determine the Correct Classification**:
- The question specifically asks for a chromosome where the centromere is very close to one end, leading to one extremely short arm and one very long arm. This description matches the **acrocentric chromosome**.

4. **Conclusion**:
- The chromosome type that fits the description is **acrocentric**.

### Final Answer:
The chromosome in which the centromere is situated close to its end, forming one extremely short arm and one very long arm, is called **acrocentric**.