Explain genetic and epigenetic inheritance with respect to nucleosomes?

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Genetic and epigenetic inheritance with respect to nucleosomes(explain, please)

Epigenetics is the study of heritable and stable changes in gene expression that occur through alterations in the chromosome rather than in the DNA sequence.  Despite not directly altering the DNA sequence, epigenetic mechanisms can regulate gene expression through chemical modifications of DNA bases and changes to the chromosomal superstructure in which DNA is packaged