amplification

Science Dictionary
amplification   (ām'plə-fĭ-kā'shən)  Pronunciation Key 
An increase in the magnitude or strength of an electric current, a force, or another physical quantity, such as a radio signal.
American Heritage
Science Dictionary
gene amplification  
An increase in the number of copies of a gene in a cell, resulting in an elevation in the level of the RNA or protein encoded for by the gene and a corresponding amplification of the phenotype that the gene confers on the cell. Drug resistance in cancer cells is linked to amplification of the gene that prevents absorption of the chemotherapeutic agent by the cell.
The American Heritage® Science Dictionary
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