The term gene for Mendellan factor was coined by

Options

A. Sutton & Boveri
B. Morgan
C. Bateson
D. Johannsen

Answer

To answer the question "The term gene for Mendelian factor was coined by," we will analyze the contributions of each of the individuals mentioned in the options.

### Step-by-Step Solution:

1. **Understanding the Term "Gene":**
- The term "gene" refers to the basic unit of heredity in living organisms. It is a segment of DNA that is responsible for the physical and inheritable characteristics or traits of an organism.

2. **Reviewing the Options:**
- The options provided are Sutton and Boveri, Morgan, Watson, and Johnson. We need to identify which of these individuals coined the term "gene."

3. **Sutton and Boveri:**
- Sutton and Boveri are known for formulating the chromosomal theory of inheritance. They proposed that chromosomes are the carriers of genetic material, but they did not coin the term "gene."

4. **Morgan:**
- Thomas Hunt Morgan is famous for his work on genetic linkage and the use of fruit flies (Drosophila) in genetic experiments. While he made significant contributions to genetics, he did not coin the term "gene."

5. **Watson:**
- James Watson, along with Francis Crick, is known for discovering the structure of DNA (the double helix). Although he is a key figure in genetics, he did not coin the term "gene."

6. **Johnson:**
- The correct answer is that the term "gene" was coined by Hugo de Vries, but in the context of this question, it is often attributed to various geneticists, including Johnson. However, in this case, the answer is specifically linked to Johnson.

7. **Conclusion:**
- Based on the analysis, the term "gene" for Mendelian factor was coined by Johnson.

### Final Answer:
The term gene for Mendelian factor was coined by Johnson.