A chromosome with sub terminal centromere is
(a) Telocentric chromosome
(b) Acrocentric chromosome
(c) Metacentric-chromosome
(d) Sub-metacentric chromosome

Options

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

Answer

To solve the question regarding the type of chromosome with a sub-terminal centromere, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Chromosome Structure**:
- Chromosomes are structures within cells that contain DNA. They are characterized by their shape and the position of the centromere, which is the region where the two sister chromatids are joined.

2. **Identify Types of Chromosomes Based on Centromere Position**:
- Chromosomes are classified into four main types based on the position of the centromere:
- **Telocentric**: Centromere is located at the terminal end of the chromosome.
- **Acrocentric**: Centromere is located slightly off-center, resulting in one arm being significantly shorter than the other.
- **Metacentric**: Centromere is located in the center, resulting in two arms of equal length.
- **Sub-metacentric**: Centromere is located slightly off-center, but not as much as in acrocentric chromosomes, leading to one arm being longer than the other.

3. **Analyze the Given Options**:
- The question asks for a chromosome with a "sub-terminal centromere." This indicates that the centromere is not at the center (metacentric) and is not at the terminal end (telocentric).

4. **Determine the Correct Answer**:
- Based on the definitions:
- A "sub-terminal" centromere corresponds to an acrocentric chromosome, where the centromere is located near one end but not at the very end.
- Therefore, the correct answer is **(b) Acrocentric chromosome**.

### Final Answer:
The chromosome with a sub-terminal centromere is **(b) Acrocentric chromosome**.

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