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The chromosome is acentric when...

The chromosome is acentric when

A

Centromere is present at one end

B

Centromere is near one end

C

Centromere is slightly away from midpoint

D

Centromere is absent

Text Solution

AI Generated Solution

The correct Answer is:
To determine when a chromosome is acentric, we need to understand the role of the centromere and its positioning on the chromosome. Here’s a step-by-step solution: ### Step-by-Step Solution: 1. **Understanding Chromosomes**: Chromosomes are structures that carry genetic material (DNA) and contain genes. They play a crucial role during cell division. 2. **Role of the Centromere**: The centromere is a specific region on a chromosome that is essential during mitosis (cell division). It is the point where the two sister chromatids are joined and is crucial for the proper segregation of chromosomes into daughter cells. 3. **Types of Chromosomes Based on Centromere Position**: - **Telocentric Chromosome**: The centromere is located at one end of the chromosome. - **Acrocentric Chromosome**: The centromere is located near one end of the chromosome. - **Submetacentric Chromosome**: The centromere is slightly away from the midpoint, resulting in one arm being longer than the other. 4. **Identifying Acentric Chromosomes**: A chromosome is considered acentric when it lacks a centromere entirely. This means that there is no centromere present to facilitate proper attachment to spindle fibers during cell division. 5. **Conclusion**: Therefore, the correct answer to the question "The chromosome is acentric when..." is that the centromere is absent. ### Final Answer: The chromosome is acentric when the centromere is absent (Option 4). ---
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