Which definition correctly captures the essence of epigenetics? (Use recall.)

Epigenetics refers to chemical modifications to DNA or histone proteins that affect gene expression without altering the underlying DNA sequence.

Epigenetics is the dietary practice of consuming specific epigenes to directly build proteins in the cytoplasm.

Epigenetics is the process of permanent mutation of DNA sequences which leads to changes in gene expression across generations.

Epigenetics describes changes in chromosome number (aneuploidy) that alter gene expression in developing tissues by physically deleting genes from the genome.