Why did Luria and Delbruck interpret their fluctuation test results to indicate

Question

Why did Luria and Delbruck interpret their fluctuation test results to indicate that mutations occur continually and by chance and not in response to a selective environment? Answer They grew bacteria and exposed them to T1 phage. They saw very different numbers of bacterial colonies on different plates, indicating that mutations occur at various times by chance. They grew bacteria under controlled conditions and did not apply selective pressures. They grew bacteria and exposed them to T1 phage. They saw very similar numbers of bacterial colonies on all of the plates, indicating that mutations occur constantly. They grew bacteria and exposed them to mutagens. They only mutants they ever saw were when they used the mutagens.

Explanation / Answer

They grew bacteria and exposed them to T1 phage. They saw very similar numbers of bacterial colonies on all of the plates, indicating that mutations occur constantly.

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