DNA Notes

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Brief history and description of the discovery of DNA structure.

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DNA Notes

  1. 1. DNA Presented by Mrs. Sanford 7th Life Science Barber Middle School
  2. 2. DNA (Deoxyribonucleic Acid) <ul><li>chemical code </li></ul><ul><li>master copy of instructions for cell structure and function </li></ul><ul><li>agenda </li></ul><ul><li>blueprints </li></ul><ul><li>owner’s manual </li></ul>
  3. 3. DNA (Deoxyribonucleic Acid) <ul><li>chemical code </li></ul><ul><li>gives you your characteristics </li></ul><ul><li>traits like hair color, eye color, height, personality, talents </li></ul>
  4. 4. DNA (Deoxyribonucleic Acid) <ul><li>chemical code </li></ul><ul><li>organic compound </li></ul><ul><li>contains carbon </li></ul><ul><li>nucleic acid </li></ul>
  5. 5. DNA (Deoxyribonucleic Acid) <ul><li>structure (what it looks like) </li></ul><ul><li>three dimensional helix </li></ul><ul><li>spiral staircase </li></ul><ul><li>twisted ladder </li></ul>
  6. 6. DNA (Deoxyribonucleic Acid) <ul><li>structure </li></ul><ul><li>sides or “handrails” are made of sugars and phosphates </li></ul><ul><li>‘ ribo’ is for ribose, a sugar </li></ul>
  7. 7. DNA (Deoxyribonucleic Acid) <ul><li>structure </li></ul><ul><li>cross pieces, “rungs” or “steps” are made of nitrogen base pairs </li></ul><ul><li>Same two bases always pair </li></ul><ul><li>adenine, thymine (A, T) </li></ul><ul><li>cytosine, guanine (C, G) </li></ul>
  8. 8. DNA (Deoxyribonucleic Acid) <ul><li>discovery/history </li></ul><ul><li>1950’s </li></ul><ul><li>x-rayed by Rosalind Franklin </li></ul>DNA X-ray Rosalind Franklin
  9. 9. DNA (Deoxyribonucleic Acid) <ul><li>discovery/history </li></ul><ul><li>1950’s -1960’s </li></ul><ul><li>Maurice Wilkins gives Franklin’s x-rays to Watson and Crick </li></ul><ul><li>Francis Crick and James Watson make a model of DNA </li></ul>
  10. 10. DNA (Deoxyribonucleic Acid) <ul><li>discovery/history </li></ul><ul><li>1960’s </li></ul><ul><li>Franklin dies of cancer </li></ul><ul><li>Wilkins, Watson, and Crick share a Nobel Prize for the model </li></ul>
  11. 11. DNA (Deoxyribonucleic Acid) Wilkins Watson and Crick DNA Model DNA Model Sketch
  12. 12. DNA (Deoxyribonucleic Acid) <ul><li>DNA replication </li></ul><ul><li>happens in interphase </li></ul><ul><li>Watson and Crick also modeled this </li></ul>
  13. 13. DNA (Deoxyribonucleic Acid) <ul><li>DNA replication </li></ul><ul><li>enzymes break apart the bases </li></ul><ul><li>RNA collects extra bases from the cytoplasm </li></ul>
  14. 14. DNA (Deoxyribonucleic Acid) <ul><li>DNA replication </li></ul><ul><li>the extra bases pair with the broken DNA strands </li></ul><ul><li>new handrails form from sugars and phosphates </li></ul>
  15. 15. DNA (Deoxyribonucleic Acid) <ul><li>DNA replication </li></ul><ul><li>Two new strands have been created </li></ul>
  16. 16. DNA (Deoxyribonucleic Acid) <ul><li>Mutation </li></ul><ul><li>Damaged chromosomes </li></ul><ul><li>Mismatched base pairs </li></ul>
  17. 17. DNA (Deoxyribonucleic Acid) <ul><li>Mutation </li></ul><ul><li>- Mistakes in the DNA </li></ul><ul><li>Example: albinism </li></ul>

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