Epigenetics Explained -- Sort Of

Epigenetics is the study of changes in gene expression or cellular phenotype, caused by mechanisms other than changes in the underlying DNA sequence. It refers to functionally relevant modifications to the genome that do not involve a change in the nucleotide sequence. Gene expression can be controlled through the action of repressor proteins that attach to silencer regions of the DNA. These changes may remain through cell divisions for the remainder of the cell's life and may also last for multiple generations. However, there is no change in the underlying DNA sequence of the organism.

Eyes glazed over? Have a look at this video for a simple and entertaining explanation of epigenetics for those of us who are not research scientists.