Definitions for "Genomic Imprinting"
The phenomenon where there is a difference in the expression of the genes inherited from the father and the mother.
An epigenetic modification in the expression of a gene or genes which varies in its effect depending on whether the active allele is inherited from the mother or the father.
epigenetics, expression of imprinted genes is monoallelic and dependent upon the parents sex (parental imprinting), in contrast most genes (which are non-imprinted) have biallelic expression. This is an heritable change that does not alter DNA sequence. (More? Week 1 Notes)