Shape of chromosomes is determined by position of

Options

A. centrosome
B. Centromere
C. Telomere
D. Micromere

Answer

To determine the shape of chromosomes, we need to understand the role of the centromere. Here's a step-by-step solution to the question:

### Step-by-Step Solution:

1. **Identify the Key Component**: The question asks about what determines the shape of chromosomes. The key component related to chromosome shape is the centromere.

2. **Understand the Centromere**: The centromere is a specific region on a chromosome that appears as a constriction. It is a lightly stained part of the chromosome and is crucial during cell division.

3. **Types of Chromosome Shapes**: The position of the centromere divides chromosomes into four main types:
- **Metacentric Chromosomes**: The centromere is located in the middle, resulting in two equal arms.
- **Submetacentric Chromosomes**: The centromere is slightly off-center, leading to one arm being longer than the other.
- **Acrocentric Chromosomes**: The centromere is located closer to one end, creating one very short arm and one long arm.
- **Telocentric Chromosomes**: The centromere is at the very end of the chromosome, resulting in a single arm.

4. **Conclusion**: Based on the position of the centromere, we can conclude that the shape of chromosomes is determined by the position of the centromere. Therefore, the correct answer to the question is option number two: **centromere**.