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Evolution - Random Food Model.

The cells wander around looking for food. The grey line around them is their food-detection range. When they are fully grown the grey line goes black and the cell can breed or fight. New cells take a mixture of DNA from their parents with a little random variation. DNA is represented here by the three colours red, green and blue. When a cell's DNA is more than half one colour it becomes a 'Killer cell' and will fight any other cell that has less then half it's colour. The biggest cell wins. Which will become the dominant gene? Natural selection will choose.
Speed, size and food-detection range are also part of a cells DNA but are not considered in fights. In this random-food model the cells should become larger and faster to detect food better and survive famines.