Question

Describe the epigenetic marks that occur on DNA and the effect they have on gene expression when they are present.

Answer 1

Heyyy

Epigenetics is the study of heritable phenotype changes that do not involve alterations in the DNA sequence.[1] The Greek prefix epi- (ἐπι- "over, outside of, around") in epigenetics implies features that are "on top of" or "in addition to" the traditional genetic basis for inheritance.[2] Epigenetics most often denotes changes that affect gene activity and expression, but can also be used to describe any heritable phenotypic change. Such effects on cellular and physiological phenotypic traits may result from external or environmental factors, or be part of normal development. The standard definition of epigenetics requires these alterations to be heritable,[3][4] either in the progeny of cells or of organisms.