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Consider the Following Experiment

Question 22

Multiple Choice

Consider the following experiment. First, large populations of two mutant strains of Escherichia coli are mixed, each requiring a different, single amino acid. After plating them onto a minimal medium, 45 colonies grew. Which of the following may explain this result?


A) The colonies may be due to back mutation (reversion) .
B) The colonies may be due to recombination.
C) Either A or B is possible.
D) Neither A nor B is possible.

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