DNA methylation is the addition of the methyl group to the genetic material. Methylation, which does not change the nucleotide sequence but does affect gene expression is called epigenetic modifications.
Epigenetic modifications are said to be involved with the turning off and on of the genes. This type of alteration does not affect the nucleotide sequences of the DNA.
The process of methylation results in an alteration of the transcription that leads to epigenetic modifications. It alters the expression of the genes and their traits.
Therefore, epigenetic modification is the correct blank.
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