Epigenetics Questions

After reading the article "Epigenetics: From islands to shores" answer these questions with complete sentences.

  1. What is DNA methylation? What does it do?
  2. What are epigenetic changes?
  3. Identical twins have the exact same DNA. Why aren't they exactly identical?
  4. How are identical twins formed in the womb?
  5. How are fraternal twins formed?
  6. How do errors in reproducing epigenetic patterns contrast with DNA replication?
  7. Explain how mouse DNA methylation told researchers about the relative age of methylation.
  8. What is a CpG island?
  9. What are the shores of a CpG island?