Which one is not possible due to mitosis?

Options

A. Wound healing
B. Regeneration
C. Grafting
D. Reduction of chromosome number

Answer

To solve the question "Which one is not possible due to mitosis?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Mitosis**:
- Mitosis is a type of cell division that results in two daughter cells that are genetically identical to the parent cell. It is also known as equational division because the chromosome number remains the same before and after the division.

2. **Identify the Options**:
- The options provided are:
- Wound healing
- Regeneration
- Grafting
- Reduction of chromosome number

3. **Analyze Each Option**:
- **Wound Healing**: This process involves the production of new cells to replace damaged ones, which occurs through mitosis. Thus, mitosis is involved in wound healing.
- **Regeneration**: Similar to wound healing, regeneration involves the formation of new cells to replace lost or damaged tissues. This process also relies on mitosis.
- **Grafting**: In horticulture, grafting involves the joining of two plant parts (the scion and the stock). Mitosis is involved in the healing and integration of these tissues.
- **Reduction of Chromosome Number**: This process does not occur during mitosis. Instead, it occurs during meiosis, which is a different type of cell division that reduces the chromosome number by half.

4. **Conclusion**:
- Among the options, the only process that is not possible due to mitosis is the "Reduction of chromosome number." Therefore, the correct answer is the fourth option.

### Final Answer:
- The process that is not possible due to mitosis is **Reduction of chromosome number**.