The sequence of DNA from where replication starts is called …….

Options

A. selectable marker
B. origin of replication
C. ter sequence
D. genetic sequence

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the specific term that refers to the sequence of DNA where replication begins.

2. **Identifying Key Terms**: The options provided are:
- Selectable marker
- Origin of replication
- Test sequence
- Genetic sequence

3. **Analyzing Each Option**:
- **Selectable Marker**: This is a gene used to identify cells that have taken up a particular DNA molecule.
- **Origin of Replication**: This is the specific location on the DNA where replication starts. It is crucial for the process of DNA replication.
- **Test Sequence**: This term does not specifically relate to DNA replication.
- **Genetic Sequence**: This refers to the order of nucleotides in a DNA molecule but does not indicate where replication starts.

4. **Choosing the Correct Answer**: Based on the definitions and functions of the terms, the correct answer is "Origin of replication" (often abbreviated as ORI). This is the site where the process of DNA replication initiates.

5. **Conclusion**: The sequence of DNA from where replication starts is called the **Origin of Replication**.

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