Genomic Imprinting

In genetics, genomic imprinting means that the expression of some alleles depends on from which parent that allele comes; it is an epigenetic event.

Genomic imprinting occurs during the formation of gametes and causes only one copy of a particular gene to be expressed.

The majority of imprinted genes are found on the autosomes, not on the sex chromosomes. The process of imprinting usually happens through methylation; the adding of a methyl group to a given gene sequence.