Answer: -the way genetic information is put into action
What is gene expression?

Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product that enables it to produce protein as the end product. These products are often proteins but in non-protein-coding genes such as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes the product is a functional RNA. Gene expression is summarized in the central dogma of molecula…

Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product that enables it to produce protein as the end product. These products are often proteins but in non-protein-coding genes such as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes the product is a functional RNA. Gene expression is summarized in the central dogma of molecular biology first formulated by Francis Crick in 1958 further developed in his 1970 article and expanded by the subsequent discoveries of reverse transcription and RNA replication. The process of gene expression is used by all known life—eukaryotes (including multicellular organisms) prokaryotes (bacteria and archaea) and utilized by viruses—to generate the macromolecular machinery for life. In genetics gene expression is the most fundamental level at which the genotype gives rise to the phenotype i.e. observable trait. The genetic information stored in DNA represents the genotype whereas the phenotype results from the "interpretation" of that information. Such phenotypes are often expressed by the synthesis of proteins that control the organism's structure and development or that act as enzymes catalyzing specific metabolic pathways. All steps in the gene expression process may be modulated (regulated) including the transcription RNA splicing translation and post-translational modification of a protein. Regulation of gene expression gives control over the timing location and amount of a given gene product (protein or ncRNA) present in a cell and can have a profound effect on the cellular structure and function. Regulation of gene expression is the basis for cellular differentiation development morphogenesis and the versatility and adaptability of any organism. Gene regulation may therefore serve as a substrate for evolutionary change.

Transcription The production of a RNA copy from a DNA strand is called transcription and is performed by RNA polymerases which add one ribo nucleotide at a time to a growing RNA strand as per the complementarity law of the nucleotide bases. This RNA is complementary to the template 3′ … ...

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