The chromosomes which lacks a centromere is

Options

A. Acentric
B. Acrocentric
C. Metacentric
D. Telocentric

Answer

To solve the question "The chromosomes which lacks a centromere is", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terminology**:
- First, we need to understand what a centromere is. The centromere is the region of a chromosome where the two sister chromatids are joined together and is crucial for the proper segregation of chromosomes during cell division.

2. **Identify the Types of Chromosomes**:
- The question provides several options: acentric, acrocentric, metacentric, and telocentric. We need to define each type:
- **Acentric**: Chromosomes that lack a centromere.
- **Acrocentric**: Chromosomes with the centromere located near one end.
- **Metacentric**: Chromosomes with the centromere located in the center, resulting in two equal arms.
- **Telocentric**: Chromosomes with the centromere at one end, making them appear rod-shaped.

3. **Analyze the Options**:
- From the definitions:
- Acentric chromosomes are defined as those that do not have a centromere.
- Acrocentric, metacentric, and telocentric all have centromeres, just located at different positions.

4. **Conclusion**:
- Based on the definitions and analysis, the correct answer to the question is **acentric chromosomes**, as they are the only type that completely lacks a centromere.

### Final Answer:
The chromosomes which lack a centromere is **acentric**.

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