Eukaryotic genomes have many copies of genes H1, H2A, H2B, and H3, but some copies have accumulated mutations and are called histone

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A: Answer--

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A:

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A: Epigenetics are the changes in gene expression. 

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.