Question

Which of the following genetic recombination process is not useful for mapping bacterial and viral chromosomes?

• A. Denaturation of DNA
• B. Viral Transduction
• C. Transformation
• D. Sexual Conjugation

Hint:

For bacterial genetic mapping, remember three important recombination-related methods: transformation, transduction, and conjugation. DNA denaturation is only strand separation, not recombination.

Answer 1

The Correct Option is A

Concept:
Genetic recombination is an important biological process in which genetic material is exchanged between organisms or cells. In bacteria and viruses, recombination methods are very useful for genetic mapping because they help to determine the relative position of genes on chromosomes.

Step 1: Understand genetic mapping.
Genetic mapping means finding the arrangement and relative position of genes on a chromosome. In bacteria and viruses, mapping is often done using recombination-based methods.

Step 2: Check viral transduction.
Viral transduction occurs when a bacteriophage transfers genetic material from one bacterium to another. This process is useful in bacterial gene mapping. \[ \text{Viral transduction} \rightarrow \text{Useful for mapping} \]

Step 3: Check transformation.
Transformation occurs when bacteria take up free DNA from the surroundings. This can be used to study linkage and gene position. \[ \text{Transformation} \rightarrow \text{Useful for mapping} \]

Step 4: Check sexual conjugation.
Sexual conjugation involves transfer of DNA from donor bacterium to recipient bacterium through direct contact. It is very useful in bacterial chromosome mapping. \[ \text{Sexual conjugation} \rightarrow \text{Useful for mapping} \]

Step 5: Check denaturation of DNA.
Denaturation of DNA means separation of two DNA strands by breaking hydrogen bonds. It is a physical process, not a genetic recombination process. Therefore, it is not useful for mapping bacterial and viral chromosomes. \[ \therefore \text{Correct Answer is (A)} \]