The function of a selectable maker is

Options

A. Eliminating transformants and permitting non- transformants
B. Identify ori site
C. Elimination of non-transformants and permitting transformants
D. To destroy recognition sites

Explanation

### Step-by-Step Solution:

1. **Understanding Selectable Markers**: A selectable marker is a gene introduced into a cell that allows for the identification of cells that have taken up a particular plasmid or DNA fragment.

2. **Function of Selectable Markers**: The primary function of a selectable marker is to eliminate non-transformants (cells that did not take up the plasmid) and permit the growth of transformants (cells that successfully incorporated the plasmid).

3. **Mechanism of Action**: Selectable markers often confer resistance to antibiotics or allow for the synthesis of a compound that is essential for cell survival. For example, if a selectable marker provides resistance to an antibiotic, only those cells that have taken up the plasmid will survive in the presence of that antibiotic.

4. **Importance in Biotechnology**: This mechanism is crucial in genetic engineering and molecular biology, as it allows researchers to isolate and propagate only those cells that have successfully integrated the desired genetic material.

5. **Conclusion**: Therefore, the function of a selectable marker is to eliminate non-transformants and permit transformants to grow under selective conditions.

### Final Answer:
The function of a selectable marker is to eliminate non-transformants and permit transformants to grow.

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