Epigenetics is the study of heritable phenotype that do not involve alterations in the DNA arrangement and there functionally and do the relevant changes to the genome that not include a change in the nucleotide sequence.  Gene expression can be measured finished the exploit of proteins that will attach to the silencer districts of the DNA. Epigenetic variations may last finished cell separations from the duration of the cells life and it may last for several generations but even though they do not involve deviations in the underlying DNA sequence of the organism. The related chromatin proteins may be modified, of causing activation or quieting. This machine allows the eminent cells in a multicellular organism to fast only the genes which are necessary for their own activity. Epigenetic changes are conserved when cells divide epigenetics is the study of genetic phenotype changes that do not involve changes in the DNA sequence.