Maximum arm ratio is found in

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding Chromosome Types**:
- Chromosomes can be classified based on the position of their centromere into four main types: metacentric, submetacentric, acrocentric, and telocentric.

2. **Defining Arm Ratio**:
- The arm ratio of a chromosome is calculated by dividing the length of the longer arm (q) by the length of the shorter arm (p). A higher arm ratio indicates a more pronounced difference in the lengths of the two arms.

3. **Identifying Chromosome Types**:
- **Metacentric Chromosome**: The centromere is located in the middle, resulting in two arms of equal length.
- **Submetacentric Chromosome**: The centromere is slightly off-center, leading to one arm being longer than the other but not by a large margin.
- **Acrocentric Chromosome**: The centromere is located very close to one end, resulting in a very short p arm and a much longer q arm.
- **Telocentric Chromosome**: The centromere is at the very end of the chromosome, resulting in only one arm.

4. **Analyzing Arm Ratios**:
- Among these types, acrocentric chromosomes have the shortest p arm, which can be so short that it is difficult to observe. This results in a significantly higher arm ratio compared to the other types.

5. **Conclusion**:
- The maximum arm ratio is found in acrocentric chromosomes due to their structural characteristics.

### Final Answer:
The maximum arm ratio is found in **acrocentric chromosomes**.

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