It comes from the Ancient Greek for descent (genea); the word "generation" comes from the same root.
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Gene expression is the process by which the information encoded in a gene is used to direct the assembly of a protein molecule. The cell reads the sequence of the gene in groups of three bases. Each group of three bases (codon) corresponds to one of 20 different amino acids used to build the protein.
The expression of a gene is called the phenotype.
Differential gene expression refers to the gene expression that reacts to stimuli or triggers. It is a means of gene regulation where certain hormones produce an effect on protein biosynthesis.
Passive gene- environment correlations evocative gene- environment correlations active gene- environment correlation
Cloning vectors are used to increase the number of copies of the cloned gene or to amplify a foreign gene. Expression vectors are used to increase the expression of the foreign gene product.