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The genetic code refers to the **DNA** alphabet (A, T, C, G), the RNA alphabet (A, U, C, G), and the polypeptide alphabet (20 amino acids). The Central Dogma describes the flow of genetic information in the cell, from genes to mRNA to proteins. In this process, genes are transcribed to create mRNA, and mRNA is then translated to synthesize proteins. The genetic code is considered degenerate because the 64 triplet codons in mRNA encode only 20 amino acids plus three stop codons. Remarkably, nearly every species on Earth uses this same genetic code. *LICENSES AND ATTRIBUTIONS CC licensed content, Shared previously, The Genetic Code, Authored by: OpenStax College. License: CC BY: Attribution. License Terms: Download for free at http://cnx.org/contents/QEibhJMi@7/The-Genetic-Code*
