Does osmosis occur in an isotonic solution, and if so, how does it differ from osmosis in other types of solutions?

Yes, osmosis can occur in an isotonic solution. In an isotonic solution, the concentration of solutes inside and outside the cell is the same, so there is no net movement of water across the cell membrane. This differs from osmosis in other types of solutions, such as hypertonic or hypotonic solutions, where there is a concentration gradient that causes water to move into or out of the cell to reach equilibrium.