A bacterial culture is treated with streptomycin and a cast is made. A few columns are also to survive due to

Selection

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Adaption

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Induced mutation

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Mimicry

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Solution

The correct option is A Selection
Joshua Lederberg and Esther Lederberg showed the genetic basis of adaptations in bacteria by culturing bacterial cells by their plating experiment. Lederberg's replica plating experiment provided a support to neo-Darwinism and proved that the streptomycin-resistance adaptation in the bacterial cells originated due to selection of pre-existing mutant forms of bacteria by nature. Streptomycin-resistant bacteria cells had no advantage to multiply in an environment when there was no streptomycin. But, they had a competitive edge on others in streptomycin contouring agar plates, so they multiplied rapidly and formed colonies in the streptomycin containing medium. So, a bacterial culture is treated with streptomycin and a cast is made. A few columns are also to survive due to selection process and not due to adaptation, induced mutation and mimicry.
Therefore, the correct answer is option A.

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