Biology - College Biology - Molecular - Epigenetics - Beyond the DNA Sequence

4 steps. Step 1: 'EPIGENETICS means changes in gene expression that don't alter the DNA sequence itself. Like sticky notes on a book - they change which pages you read without changing the text.' Step 2: 'DNA METHYLATION - Adding methyl groups (CH₃) to cytosine bases. Methylated promoters are usuall