Question

In specialized transduction, $\lambda$ phage transduces ............ genes of Escherichia coli.

• A. trp
• B. gal
• C. bio
• D. All the above

Answer 1

The correct option is D All the above

Specialized transduction is a process where a special set of genes are transferred to another bacterium which takes place by site-specific recombination. The lambda phage has two cos sites which help the phage to ligate. When lambda DNA is introduced in E.coli it gets cyclized due to cos sites. Due to the location of lambda phage in E.coli genome, all the genes are transduced. So, the trp, gal, bio genes are tranduced due to site-specific recombination in specialized transduction. Thus, the correct answer is option D.