This is a programming lesson that models cell movement up a chemical gradient, model with the chemotaxis mat that has a white to black gradient printed on it. In this lesson, students build on the idea of outlining a program as a series of scenarios and responses. This program isa bit more complex than the phototaxis program lesson as they will need to build their chemotaxis program from scratch. They are given a program called Chemosense that helps them calibrate the color sensor to the chemotaxis mat. At the end of this activity, student groups are asked to present their completed chemotaxis program.

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