Which of these statements about linkage groups are correct ?

Options

A. Drosophila has four linkage groups while pisum has seven linkage groups
B. Drosophila has eight linkage groups while pisum has fourteen linkage groups
C. Pisum has four linkage groups while Drosophila has fourteen linkage groups
D. Pisum has eight linkage groups while Drosophila has fourteen linkage groups

Answer

To determine which statements about linkage groups are correct, we need to understand the concept of linkage groups and the number of linkage groups present in various organisms.

### Step-by-Step Solution:

1. **Understanding Linkage Groups**:
- Linkage groups are formed by genes that are located close to each other on the same chromosome. These genes tend to be inherited together during meiosis due to their proximity.

2. **Identifying the Number of Linkage Groups in Different Organisms**:
- **Drosophila (fruit fly)**: It has 4 linkage groups corresponding to its 4 pairs of chromosomes.
- **Pisum sativum (pea plant)**: It has 7 linkage groups corresponding to its 7 pairs of chromosomes.
- **Neurospora (a type of fungus)**: It also has 7 linkage groups.
- **Humans**: Humans have 23 linkage groups, which correspond to the 23 pairs of chromosomes.
- **Mucor (a type of fungus)**: It has 2 linkage groups.

3. **Evaluating the Statements**:
- If the statements provided in the question mention the number of linkage groups for these organisms, we can determine their correctness based on the information above.
- For example, if a statement claims that Drosophila has 8 linkage groups, that would be incorrect. If it claims that Pisum sativum has 4 linkage groups, that would also be incorrect.

4. **Conclusion**:
- After evaluating the statements based on the known number of linkage groups for each organism, we can identify which statements are correct.

### Final Answer:
The correct statements regarding linkage groups are those that accurately reflect the number of linkage groups in the mentioned organisms.