All cells in an organism contain a full copy of that organism's DNA. Your ears do not produce digestive enzymes because

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Quizplus · Accepted Answer

Different genes are expressed in different parts of an organism, so the cells in your ears do not produce digestive enzymes because they are not expressing the genes responsible for producing such enzymes. All cells in an organism contain a full copy of that organism's DNA, but they only express (or activate) certain genes based on their function and location in the body. It is not the case that stomach cells have extra DNA or that ear cells have nonfunctional DNA. Some DNA may be deleted in cells where it is not needed, but this is not a primary factor in determining which genes are expressed in which cells.

All Cells in an Organism Contain a Full Copy of That