Genes

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are like blueprints for building a house, except that they carry the plans for building cells, and organs. They have the instructions for making the thousands of chemical building blocks, called in the body. Differences in genes cause individuals to have different traits such as hair , blood type or skin colour.
A gene gives only the potential for the of a trait. How this trait develops depends partly on the . For example, a person may have a genetic tendency toward being overweight. But the person's actual weight will depend on such environmental factors as to what kinds of the person eats and how much that person does.