process by which maternally and paternally derived chromosomes are uniquely
chemically modified leading to different expression of a certain gene or
genes on those chromosomes depending on their parental origin
Definition from: GeneReviews
from the University of Washington and the National Center for Biotechnology Information
- A phenomenon in which the disease phenotype depends on which parent passed on the disease gene. For instance, both Prader-Willi and Angelman syndromes are inherited when the same part of chromosome 15 is missing. When the father's complement of 15 is missing, the child has Prader-Willi, but when the mother's complement of 15 is missing, the child has Angelman syndrome.
Definition from: Human Genome Project Information
at the U.S. Department of Energy
Related discussion in the Handbook
See also Understanding Medical Terminology.