Genetic recombination & first indication of sexuality in bacteria was discovered by

Options

A. Lederberg & tatum
B. Griffth
C. Woll man
D. Zinder

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the discovery of genetic recombination and the first indication of sexuality in bacteria.

2. **Identifying Key Figures**: The options provided are Lederberg and Tatum, Griffith, Vollmann, and Zinder. We need to analyze the contributions of each to determine who made the relevant discovery.

3. **Lederberg and Tatum's Contribution**: In 1946, Lederberg and Tatum discovered bacterial conjugation, which is a process where genetic material is transferred between two bacterial strains through direct contact (a conjugation tube). This process is a clear indication of sexual reproduction in bacteria.

4. **Griffith's Contribution**: Frederick Griffith conducted experiments in 1928 that demonstrated transformation in bacteria, where genetic material is transferred from one strain to another without physical contact. However, this does not provide a clear indication of sexuality since it lacks direct contact.

5. **Vollmann's Contribution**: Vollmann, along with Hise and Jacob, showed the presence of different mating types in bacteria, indicating some form of sexual differentiation. However, this was not the first indication of sexuality.

6. **Zinder's Contribution**: Zinder's work involved bacteriophages and RNA but did not directly relate to the discovery of sexual reproduction in bacteria.

7. **Conclusion**: Based on the analysis, the correct answer is Lederberg and Tatum, as they were the first to provide clear evidence of sexual reproduction in bacteria through the process of conjugation.

**Final Answer**: The discovery of genetic recombination and the first indication of sexuality in bacteria was made by **Lederberg and Tatum**.

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