A LuriaDelbruck fluctuation test was performed to assess the

A Luria/Delbruck fluctuation test was performed to assess the frequency that T1-resistant E. coli mutants arise in a culture. Four different E. coil cultures were allowed to grow for 6 hours, and then T1 page was added. Cells were then plated and the number of phage resistant bacteria was tabulated. Explain how the results of this experiment support the hypothesis that the environment selects from pre-existing spontaneously occurring mutations.

Solution

According Luria Delbrück experiment, principle suggests that if spontaneous mutation occurs, bacteria grown on different plates would have different numbers. On the vice versa of that, if bacterial population occurs equal in numbers in different plates or culture then the mutation are induced mutation. Therefore, the result suggests that survivals from spontaneous mutations get select only.