Mutations that develop suddenly in nature are

Options

A. Spontaneous
B. Induced
C. Gene mutations
D. Chromosomes mutations.

Answer

To answer the question "Mutations that develop suddenly in nature are," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Types of Mutations**:
- Mutations can be classified into two main categories: spontaneous mutations and induced mutations.
- Spontaneous mutations occur naturally and suddenly, while induced mutations are caused by external factors, such as chemicals or radiation.

2. **Defining Spontaneous Mutations**:
- The term "spontaneous" implies that these mutations arise without any external influence or human intervention.
- They are unpredictable and can occur at any time in the genetic material.

3. **Identifying Induced Mutations**:
- Induced mutations are those that result from environmental factors or human actions.
- These mutations are not sudden in the same way spontaneous mutations are, as they are often the result of specific exposures to mutagens.

4. **Considering Gene and Chromosome Mutations**:
- Gene mutations can occur spontaneously or can be induced, but they do not specifically refer to sudden occurrences.
- Chromosome mutations also follow the same principle as gene mutations, meaning they can be spontaneous or induced.

5. **Conclusion**:
- Based on the definitions and characteristics of the types of mutations, the correct answer to the question is that mutations that develop suddenly in nature are called **spontaneous mutations**.

### Final Answer:
**Spontaneous mutations**.