If the centromere is sub-median the two arms are unequal then the chromosome is called as

Options

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

Answer

To answer the question "If the centromere is sub-median and the two arms are unequal, then the chromosome is called as?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chromosome Structure**:
- A chromosome consists of two arms, which are the sections of the chromosome on either side of the centromere.

2. **Identifying Centromere Position**:
- The centromere is the region where the two chromatids are joined together. Its position can determine the classification of the chromosome.

3. **Types of Chromosomes Based on Centromere Position**:
- **Metacentric Chromosome**: The centromere is located at the middle, resulting in two equal arms.
- **Submetacentric Chromosome**: The centromere is slightly off-center (sub-median), leading to two unequal arms.
- **Acrocentric Chromosome**: The centromere is located closer to one end, resulting in one very short arm and one long arm.
- **Telocentric Chromosome**: The centromere is located at the very end of the chromosome, resulting in only one arm.

4. **Analyzing the Given Condition**:
- The question specifies that the centromere is sub-median, which means it is not at the center but slightly off-center, creating two unequal arms.

5. **Conclusion**:
- Based on the definition of chromosome types, if the centromere is sub-median and the two arms are unequal, the chromosome is classified as **submetacentric**.

### Final Answer:
The chromosome is called **submetacentric**.

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