Gene - Definition

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A gene is a small portion of DNA, deoxyribonucleic acid, which carries the genetic information of the individual. They are positioned, in the absence of changes, in the same place on a chromosome from one individual to another, but their expression is different. Each gene determines a special characteristic of each individual. The genes also have the distinction of being inherited from the genes of the father and the mother, generating similarities between parents and their children: same hair color, eye color... and unfortunately the same defects, if the defective gene is transmitted after having undergone a mutation, meaning a change, or translocated, changing the position of a chromosome.