Which of the following mechanisms of gene regulation is epigenetic? Which of the

Question

Which of the following mechanisms of gene regulation is epigenetic?

Which of the following mechanisms of gene regulation is epigenetic?

A hormone binds to a transcription factor, making it able to bind DNA and activate transcription when  sucrose is present.
Tissue-specific patterns of nucleosome acetylation are established near a gene promoter early in development, and are perpetuated through subsequent rounds of cell division.
Different transcription factors bind to heart-specific and lung-specific enhancer regions to activate gene transcription in these tissues.
A transcriptional regulatory protein is produced only when phenylalanine levels are low, and binds to enhancer regions of genes involved in phenylalanine biosynthesis to activate their transcription.

Explanation / Answer

Tissue-specific patterns of nucleosome acetylation are established near a gene promoter early in development, and are perpetuated through subsequent rounds of cell division.

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