How many linkage groups are present in Cyanophyceae ?

Options

A. 2
B. 1
C. 4
D. 0

Answer

**Step-by-Step Solution:**

1. **Understanding Linkage Groups**:
- Linkage groups are defined as all the genes located on a single chromosome that are inherited together. This means that these genes are physically linked and tend to be passed on as a unit during reproduction.

2. **Identifying Cyanophyceae**:
- Cyanophyceae, commonly known as cyanobacteria, are a group of bacteria that perform photosynthesis. They are often mistaken for algae due to their similar appearance.

3. **Chromosomal Structure in Bacteria**:
- In bacteria, the genetic material is typically organized into a single circular chromosome. This is different from eukaryotic organisms, which may have multiple chromosomes.

4. **Determining the Number of Linkage Groups**:
- Since Cyanophyceae have a single chromosome, it follows that there is only one linkage group present. All the genes on this single chromosome will be inherited together.

5. **Conclusion**:
- Therefore, the number of linkage groups present in Cyanophyceae is one.

**Final Answer**: There is 1 linkage group in Cyanophyceae.

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