If the cheek cells are extracted in anything other than isotonic conditions, they will shrink or swell, they will not function normally, and they will not be strict.
The solution becomes hypotonic to the cell if the level of the solute outside the cell is smaller than that inside the cell. The solution becomes hypertonic in the cell if the concentration of solutes there is higher than inside the cell. The cell expands and gains volume as a result of water passing through it.
If a cell is immersed in a hypertonic solution, it will contract and start to lose water. Water rushes within cheek cells when they are immersed in a hypotonic solution, causing the cells to burst and reveal their DNA. The size of the cell doesn't change in an isotonic environment because there isn't any net water flow.
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