Final answer:
In low light conditions, vision is dominated by rod activity rather than cone activity, which is why there is not very good perception of color.
Step-by-step explanation:
When Jane lies in the dark, her eyes adjust to the low light conditions and she can see her room, though not with very good perception of color. This is because vision in low light conditions is dominated by rod activity, rather than cone activity. Rods are photoreceptor cells in the retina that are more sensitive to dim light and are responsible for vision in low light conditions, while cones are responsible for color vision and work best in bright light. However, rods do not perceive colors as effectively as cones, which is why Jane's perception of color is not very good in the low light.