Point mutation involves

Options

A. insertion
B. change in single base pair
C. duplication
D. deletion

Explanation

### Step-by-Step Solution:

1. **Understanding Point Mutation**:
- Point mutation refers to a change that occurs at a specific point in the DNA sequence. This means that only a single nucleotide (base pair) is altered.

2. **Types of Mutations**:
- Point mutations can be categorized into different types based on how the nucleotide is changed:
- **Substitution**: One base is replaced by another.
- **Insertion**: An additional base is added to the DNA sequence.
- **Deletion**: A base is removed from the DNA sequence.

3. **Identifying the Correct Option**:
- The question asks what point mutation involves. Since point mutation specifically refers to a change in a single base pair, we can eliminate options that suggest multiple changes like insertion or deletion of larger sequences.
- The correct answer is the change in a single base pair, which corresponds to a substitution mutation.

4. **Conclusion**:
- Therefore, point mutation involves a change in a single base pair in the DNA sequence.

### Final Answer:
Point mutation involves a change in a single base pair in the DNA sequence.

---