A gene carried by recombinant DNA is cloned when

Options

A. its host bacterium divides by binary fission
B. it is transcribed
C. it is fragmented by restriction enzymes
D. it is hybridized

Answer

To answer the question "A gene carried by recombinant DNA is cloned when," we need to understand the process of cloning in the context of recombinant DNA technology. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Recombinant DNA**:
- Recombinant DNA (rDNA) is formed by combining DNA from two different sources. This involves inserting a gene of interest into a vector (like a plasmid) that can replicate within a host organism.

2. **Introduction into Host Cell**:
- The recombinant DNA is introduced into a host cell, typically a bacterium. This is done through a process called transformation, where the host cell takes up the recombinant DNA.

3. **Binary Fission of Host Cell**:
- Once the recombinant DNA is inside the host cell, the cell can replicate. Bacteria reproduce asexually through a process called binary fission, where one cell divides into two identical daughter cells.

4. **Cloning Process**:
- During binary fission, the host bacterium duplicates its DNA, including the recombinant DNA. This means that each daughter cell will have an identical copy of the recombinant DNA, effectively cloning the gene carried by it.

5. **Conclusion**:
- Therefore, a gene carried by recombinant DNA is cloned when its host bacterium divides by binary fission. This ensures that the gene remains intact and is replicated in the daughter cells.

### Final Answer:
A gene carried by recombinant DNA is cloned when its host bacterium divides by binary fission.

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