Number of linkage groups in pisum sativum is

Options

A. 4
B. 5
C. 7
D. 10

Answer

To determine the number of linkage groups in Pisum sativum (pea plant), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Linkage Groups**:
- Linkage groups refer to all the genes that are located on a single chromosome. These genes are inherited together as a unit.

2. **Identifying Chromosome Count**:
- Pisum sativum has a total of 14 chromosomes.

3. **Linkage Groups and Chromosomes**:
- Each chromosome can represent a linkage group. However, not all chromosomes may have distinct linkage groups due to the presence of multiple genes on some chromosomes.

4. **Historical Context**:
- Gregor Mendel studied the pea plant and established foundational genetics principles, but the concept of linkage was discovered later by Thomas Morgan in Drosophila.
- The linkage in pea plants was described by Wilmorin and Batson in 1912.

5. **Counting Linkage Groups**:
- In the case of Pisum sativum, it has been established that there are 7 linkage groups corresponding to its chromosomes.

6. **Final Answer**:
- Therefore, the number of linkage groups in Pisum sativum is **7**.

### Conclusion:
The correct answer to the question is **7**.

---