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Genetic information is passed from one generation to the next- this is called inheritance. Genetic information is stored in DNA, which is found in the nucleus of eukaryotic cells. The complete amount of genetic information present in an organism is called the genome.
The human genome contains approximately 20,000-25,000 different genes arranged among 23 pairs of chromosomes. These genes contain the code to make proteins, which are involved in the development and functioning of body organs and systems. Proteins are essential to life and have many functions in the body, for example, as enzymes, regulators and structural molecules.