Epigenetic modifications tag a gene to turn it on or off but do not change the gene itself.

Name: Epigenetic modifications tag a gene to turn it on or off but do not change the gene itself.
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Epigenetic modifications, such as DNA methylation or histone modification, alter the way that genes are expressed without changing the underlying DNA sequence. These modifications can "tag" a gene to be turned on or off, but they do not change the base pairs of the gene itself.

Epigenetic Modifications Tag a Gene to Turn It on or Off