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Epigenetics

Epigenetics. Honors Biology. Twins: Identical or Fraternal?. What is Epigenetics?. Epi = “on top of” Genetics = genetic make up of an organism Epigenetics… what factors, on top of genes, impact our genetic make up. Same genes, different phenotypes. A Tale of Two Mice – part I.

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Epigenetics

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  1. Epigenetics Honors Biology

  2. Twins: Identical or Fraternal?

  3. What is Epigenetics? • Epi = “on top of” • Genetics = genetic make up of an organism • Epigenetics… what factors, on top of genes, impact our genetic make up

  4. Same genes, different phenotypes • A Tale of Two Mice – part I

  5. Complete Step 1 on Student Worksheet

  6. What does it mean to say that two individuals are genetically identical? • How can two genetically identical mice look so different?

  7. Step 2 on Student Worksheet

  8. Condensed • Chromatin Hydrogen Bonds (between bases) Decondensed Chromatin Nucleotide (consists of a base, a 5-carbon sugar, and a phosphate group) Phosphodiester Bond (between adjacent nucleotides)

  9. What is Epigenetics? • Refers to changes in gene expression caused by mechanisms other than changes in the underlying DNA sequence • Enables a cell/organism to respond to its dynamic external environment during development and throughout life! • Epigenetic changes to the genome can be inherited if these changes occur in cells giving rise to gametes

  10. Two Epigenetic Mechanisms Histone Modifications DNA Methylation Video

  11. 1. Histone modification • If the way that DNA is wrapped around the histones changes, gene expression can change (transcription)

  12. 2. DNA methylation • The addition of methyl groups to DNA can also change gene expression (transcription)

  13. A Tale of Two Mice – part II • Complete Step 3 on Student Worksheet

  14. A Tale of Two Mice – parts III-V • Finish Steps 4-5 on Student Worksheet

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