A biologist wants to know whether eating a diet high in glucose selects for larger body size in rodents. She creates two groups of mice. Group 1 is fed a standard rodent diet. Group 2 is fed a diet with 20% more glucose than is standard. The mice are housed under these conditions for 8 generations, following which all mice are fed the standard rodent diet for one generation. The biologist then weighs the mice in the 9th generation and finds that the mice in the high glucose treatment weigh significantly more than the mice in the standard glucose treatment. What was the purpose of moving the mice in the high-glucose treatment to a standard rodent diet for the final generation of the experiment?

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