The blue green algae and bacteria contain

Options

A. One linkage group
B. Two linkage groups
C. Threee linkage groups
D. None of the above

Answer

To answer the question regarding what blue-green algae and bacteria contain, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Linkage Groups**:
- A linkage group is defined as a group of genes located on the same chromosome. All the genes that are located on a single chromosome form one linkage group.

2. **Identifying the Number of Linkage Groups**:
- The total number of linkage groups in an organism corresponds to the haploid number of chromosomes. This means that if an organism has a certain number of chromosomes in its haploid set, it will have the same number of linkage groups.

3. **Examining Bacteria**:
- Most bacteria have a genome that consists of a single DNA molecule, which means they have one chromosome. Therefore, they have one linkage group.

4. **Examining Blue-Green Algae**:
- Blue-green algae, also known as cyanobacteria, similarly possess a single chromosome. This means they also have one linkage group.

5. **Conclusion**:
- Since both blue-green algae and bacteria contain only one chromosome, they each have one linkage group. Thus, the correct answer to the question is that both blue-green algae and bacteria contain one linkage group.

### Final Answer:
Both blue-green algae and bacteria contain **one linkage group**.

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