Point (Gene mutation) mutation invlves

Options

A. Duplication
B. Deletion
C. Insertion
D. Change in single base pair

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about what point (gene) mutation involves. There are four options provided: duplication, deletion, insertion, and change in a single base pair.

2. **Analyzing Each Option**:
- **Option A: Duplication**: Duplication refers to the production of one or more copies of a gene or a region of a chromosome. This does not involve a change in a single nucleotide but rather an increase in the number of copies of a segment of DNA.
- **Option B: Deletion**: Deletion is a mutation where one or more nucleotide bases are removed from a gene or a region. This is also not a point mutation since it involves the loss of nucleotides rather than a change in a single base pair.
- **Option C: Insertion**: Insertion is when one or more nucleotide bases are added into a gene or a region. Similar to deletion, this does not qualify as a point mutation because it involves adding nucleotides rather than changing a single one.
- **Option D: Change in Single Base Pair**: This is the definition of a point mutation. A point mutation involves a change in a single nucleotide in the DNA sequence, which can occur due to errors in DNA replication or exposure to certain types of radiation.

3. **Identifying the Correct Answer**: Based on the analysis, the only option that correctly describes a point mutation is **Option D: Change in single base pair**.

4. **Conclusion**: Therefore, the correct answer to the question "Point (Gene mutation) mutation involves" is **Option D**.