An example of epigenetics is when methyl groups attach to certain nucleotides to control transcription.

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This is true. Epigenetic modifications, such as DNA methylation, can alter gene expression without changing the underlying DNA sequence. Methylation occurs when a methyl group (CH3) is added to a cytosine nucleotide in the DNA molecule, typically in a CpG dinucleotide context, and can inhibit the binding of some transcription factors and/or recruit proteins that silence the gene.

An Example of Epigenetics Is When Methyl Groups Attach to Certain