While studying the concept of linkage , Morgan came to the conclusion that

Options

A. The genes were not located on the X chromosome .
B. The genes did not segregate independently .
C. The proportion of parental gene combinations is lesser than the non parental type .
D. The genes were not linked to one another .

Answer

To solve the question regarding Morgan's conclusions about linkage, we will analyze the options provided and the concept of linkage itself step by step.

### Step-by-Step Solution:

1. **Understanding Linkage**:
- Linkage refers to the phenomenon where genes that are located close together on the same chromosome tend to be inherited together. This means that they do not assort independently during meiosis.

2. **Analyzing the Options**:
- **Option A**: "Genes were located on the X chromosome."
- This statement is not universally true as linkage can occur on any chromosome, not just the X chromosome.
- **Option B**: "The genes did not segregate independently."
- This is a key conclusion from Morgan's experiments. He found that linked genes do not assort independently, which is a fundamental principle of linkage.
- **Option C**: "The portion of parental gene combinations is lesser than non-parental type."
- This statement is incorrect. In cases of linkage, the parental combinations are more frequent than non-parental combinations.
- **Option D**: "The genes were not linked to one another."
- This contradicts the concept of linkage itself, as Morgan's work was based on the observation of linked genes.

3. **Conclusion**:
- Based on the analysis, the correct conclusion Morgan reached regarding linkage is that **the genes did not segregate independently**. Therefore, the answer is **B**.