The scenario described indicates that mice with medium brown fur are favored by selection, while those with light and dark brown fur are less likely to survive due to increased visibility to predators. This type of selection is known as stabilizing selection, where individuals with intermediate traits (in this case, medium brown fur) have a higher fitness compared to those with extreme traits.
The distribution curve for a population experiencing stabilizing selection would typically show a tall, narrow peak in the center of the graph, representing the frequency of the medium brown fur phenotype.
Therefore, the correct response is:
stabilizing; a tall, narrow peak in the center of the graph.