Epigenetics

In biology, epigenetics is the study of stable phenotypic changes( known as marks) that don't involve differences in the DNA sequence. The Greek prefix in epigenetics implies features that are on top of or in addition to the traditional inheritable base for heritage. Epigenetics most frequently involves changes that affect the regulation of gene expression, but the term can also be used to describe any inheritable phenotypic change. similar goods on cellular and physiological phenotypic traits may affect from external or environmental factors, or be part of normal development. The term also refers to the medium of changes functionally applicable differences to the genome that don't involve mutation of the nucleotide sequence. Exemplifications of mechanisms that produce similar changes are DNA methylation and histone revision, each of which alters how genes are expressed without altering the beginning DNA sequence. Gene expression can be controlled through the action of repressor proteins that attach to silencer regions of the DNA.

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