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Cells control gene activity by adding or removing chemical markers along the DNA. These markers do not change the genetic code but influence how tightly the DNA is packed. When DNA is tightly wrapped, the cell cannot easily access the gene, so it remains off. When the DNA loosens, the gene becomes easier to read, and the cell can turn it on. Two major epigenetic markers include added chemical groups on DNA itself and modifications on proteins that help package DNA. These markers act like instruc