In fruit fly development expression of the bicoid gene on one end of the embryo is necessary for proper head positioning.

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Bicoid is a maternal effect gene that provides positional information to the developing embryo. It is required for the proper establishment of anterior structures and is responsible for determining the anterior-posterior axis. The absence of bicoid results in a failure to form head structures and improper body axis formation.

In Fruit Fly Development Expression of the Bicoid Gene on One