Multiple choice

Which of the following was proved by Luria and Delbruck by fluctuation test?

  1. In bacteria, genetic mutations arise in the absence of selection.

  2. In bacteria, genetic mutations arise in response to selection.

  3. Bacteria never develop resistance to their respective phages.

  4. Mutation can be induced by an external factor.
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A Correct answer
Explanation

Luria and Delbruck (1943) proved by the fluctuation test that in bacteria, genetic mutations arise in the absence of selection.

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