Epigenetics - Epigenetic

The study of epigenetics has revolutionized our understanding of genetics. Epigenetics involves changes in gene expression that do not involve alterations to the underlying DNA sequence. Instead, these changes are often caused by environmental factors, such as diet, stress, and exposure to toxins. For example, DNA methylation is a common epigenetic mechanism where methyl groups are added to the DNA molecule, typically repressing gene transcription. Crucially, some epigenetic modifications can be passed down to future generations, a concept known as transgenerational epigenetic inheritance, challenging traditional Mendelian genetics. What does the passage state about epigenetics?