Scientists performed an experiment to determine ...

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in running through a maze. They were trained by giving them a mild electric shock whenever they took a wrong turn. Immediately after each learning session, one group of mice was fed, but the other was not, A week later, all of the mice were tested to see whether they could still run the maze correctly. The group that had been fed had retained this ability, but the other group had not. The probable reason that the scientists used only mice from the same pure-bred strain is so that?

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They used mice from the same pure-bred strain so that they would all start from basically the same level of intelligence, skill, and memory.  Since this was an actual scientific study, they needed all the mice to start out equally.

If they had used mice from different families, the scientists wouldn't have been able to really say whether the mice couldn't remember the maze simply because they didn't eat.  Maybe mice from one strain happen to have bad memories regardless of whether they eat a certain amount of food or not, while another mouse strain has great memory even on minimal food.

By having mice all from the same pure-bred strain, the scientists know that each one is very, very similar in terms of how their memories will react to food fasting.

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