The scenario described suggests that medium brown fur mice have a survival advantage over both light brown and dark brown mice due to reduced predation. This is indicative of stabilizing selection, where intermediate phenotypes (in this case, medium brown fur) are favored, leading to a decrease in variation in the population.
In terms of the distribution curve for the mouse population, it would likely be represented by a tall, narrow peak in the center of the graph, signifying that most individuals have medium brown fur, with fewer individuals having light or dark brown fur.
Therefore, the correct response is:
stabilizing; a tall, narrow peak in the center of the graph.