Transduction was demonstrated by - in -

Options

A. Zinder and Lederberg . Salmonella
B. Lederberg and Tatum .E.Coli
C. Griffith .Diplococcus pneumoniae
D. Avery, MacLeod and McCarty. Streptococcus pneumoniae

Answer

To answer the question "Transduction was demonstrated by - in -", we need to identify the scientists and the organism associated with the discovery of transduction.

### Step-by-Step Solution:

1. **Understanding Transduction**:
- Transduction is a process of genetic recombination in bacteria where DNA is transferred from one bacterium to another through the action of viruses known as bacteriophages.

2. **Identifying the Scientists**:
- The scientists who first demonstrated transduction are Norton Zinder and Joshua Lederberg. They conducted their experiments in the early 1950s.

3. **Identifying the Organism**:
- The organism that Zinder and Lederberg used to demonstrate transduction was Salmonella. They showed how bacteriophages could transfer genetic material between Salmonella bacteria.

4. **Final Answer**:
- Therefore, the complete answer to the question is: "Transduction was demonstrated by Zinder and Lederberg in Salmonella."