L- shaped chromosomes are termed :

Options

A. telecentric
B. submetacentric
C. sex chromosome
D. acrocentric

Answer

To determine what L-shaped chromosomes are termed, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Chromosome Structure**: Chromosomes are structures made of DNA and proteins, and they are classified based on the position of the centromere, which is the constricted region of the chromosome.

2. **Identify Types of Chromosomes**: There are four main types of chromosomes based on centromere position:
- **Metacentric Chromosomes**: The centromere is located in the center, resulting in two equal arms. These chromosomes appear V-shaped when bent.
- **Submetacentric Chromosomes**: The centromere is slightly off-center, leading to one short arm and one long arm. When bent, these chromosomes take on an L shape.
- **Acrocentric Chromosomes**: The centromere is located closer to one end, resulting in one very short arm and one very long arm. These can appear J-shaped.
- **Telocentric Chromosomes**: The centromere is at the very end of the chromosome, resulting in an I shape.

3. **Focus on L-shaped Chromosomes**: Since the question specifically asks about L-shaped chromosomes, we need to identify which type corresponds to this shape. From our understanding:
- Submetacentric chromosomes, with their off-center centromere, create an L shape due to their unequal arm lengths.

4. **Conclusion**: Therefore, L-shaped chromosomes are termed **submetacentric chromosomes**.

### Final Answer:
L-shaped chromosomes are termed **submetacentric chromosomes**.