One type of chromosome has middle centromere whereas the other has a terminal centromere. They are

Options

A. Metacentric and acrocentric
B. Metacentric and telocentric
C. Submetacentric and telocentric
D. Telocentric and acrocentric

Answer

To solve the question about the types of chromosomes based on the position of the centromere, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chromosome Structure**:
- A chromosome consists of two sister chromatids joined at a region called the centromere. The position of the centromere can vary, leading to different classifications of chromosomes.

2. **Identify Types of Chromosomes**:
- **Metacentric Chromosomes**: These have the centromere located in the middle, resulting in two arms of equal length.
- **Submetacentric Chromosomes**: These have the centromere slightly off-center, creating one arm that is longer than the other.
- **Acrocentric Chromosomes**: These have the centromere located near one end, resulting in one very short arm and one long arm.
- **Telocentric Chromosomes**: These have the centromere located at the very end of the chromosome.

3. **Analyzing the Question**:
- The question states that one type of chromosome has a middle centromere, which corresponds to **metacentric chromosomes**.
- The other type has a terminal centromere, which corresponds to **telocentric chromosomes**.

4. **Conclusion**:
- Therefore, the answer to the question is that the two types of chromosomes are **metacentric and telocentric**.

### Final Answer:
The two types of chromosomes are **metacentric and telocentric**.

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