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Expression of an imprinted gene. Imprinted genes are expressed from only one of two chromosomes, either the chromosome derived from the father or the one derived from the mother. In this example the gene responsible for Angelman syndrome is expressed only from the maternally derived chromosome. If this chromosome has a deletion (dashed region), the child has symptoms of the disease. Source: Genes and Behavior, Principles of Neural Science, Fifth Editon Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available at: http://mhmedical.com/ Accessed: May 11, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved