The process by which the information in a gene directs the synthesis of a protein is called gene expression.
Simple scenarios where gene expression is important to consider are as follows: the modulation of insulin expression to trigger a signal for blood sugar management. Mammals' X chromosomes are inactivated to prevent an "overdose" of the genes they encode. The degree of cyclin expression controls how far the eukaryotic cell cycle advances.
A cell can respond to its changing environment through a carefully managed process called gene expression. It functions as an on/off switch to control when proteins are made as well as a volume control to increase or decrease the number of proteins produced.
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