Gene dosage

Gene dosage is the number of copies of a particular gene present in a genome. Gene dosage is related to the amount of gene product the cell is able to express. Since a gene acts as a template, the number of templates in the cell contributes to the amount of gene product able to be produced. However, the amount of gene product produced in a cell is more commonly dependent on regulation of gene expression. The normal gene dosage is dependent on the species; humans generally have two doses -- one copy from the mother and one from the father. Changes in gene dosage can be a result of copy number variation, or aneuploidy. These changes can have significant phenotypic consequences.

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