Definition of "epigenetics" [epigenetics]

• The study of the processes involved in the genetic development of an organism, especially the activation and deactivation of genes. (noun)
• The study of heritable changes caused by the activation and deactivation of genes without any change in DNA sequence. (noun)

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• "The term epigenetics refers to heritable changes in gene expression and phenotype caused by mechanisms other than changes in DNA sequence."
• "The term epigenetics refers to changes in the phenotype (appearance) or"
• "The term epigenetics refers to changes in the phenotype (appearance) or gene expression caused by mechanisms other than changes in the underlying DNA sequence."