A chromosome with one extremely short and one very long arm is

Options

A. Acrocentric
B. Telocentric
C. Metacentric
D. Sub-metacentric

Answer

To answer the question "A chromosome with one extremely short and one very long arm is," we can follow these steps:

### Step 1: Understand Chromosome Structure
- Chromosomes are made up of two arms: a long arm and a short arm. The point where the two arms meet is called the centromere.

### Step 2: Identify the Types of Chromosomes
- Chromosomes can be classified based on the position of the centromere:
- **Metacentric**: Centromere is in the middle, resulting in two arms of equal length.
- **Submetacentric**: Centromere is slightly off-center, resulting in one arm being longer than the other.
- **Acrocentric**: Centromere is closer to one end, resulting in one very short arm and one very long arm.
- **Telocentric**: Centromere is at the end, resulting in only one arm.

### Step 3: Apply the Definitions
- Given that the question specifies a chromosome with one extremely short and one very long arm, we can conclude that this description fits the definition of an acrocentric chromosome.

### Step 4: Identify Examples
- In humans, chromosomes 13, 14, and 15 are examples of acrocentric chromosomes, as they have one very short arm and one long arm.

### Conclusion
- Therefore, a chromosome with one extremely short and one very long arm is called **acrocentric**.