Genetics And Society

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Genetics And Society

  1. 1. Genetics and Society
  2. 2. How did this happen? All our modern breeds of dog are descended from the wolf.
  3. 3. Problem! <ul><li>Gamekeepers in the 1800s. </li></ul><ul><li>Poachers were stealing their game-birds. </li></ul><ul><li>Their dogs (mastiffs) were strong and great companions but were not aggressive or fast enough to chase after the poachers. </li></ul><ul><li>Another breed known was the bulldog. Quick and aggressive but not strong enough to pull the poachers down and hold them. </li></ul>
  4. 4. Humans have changed the way dogs look and act by selecting which dogs to breed together. This is called Selective Breeding X Solution Bullmastiff Large, quick, and strong
  5. 5. <ul><li>Provide a definition of selective breeding. </li></ul>Notes Selective Breeding Using the text book and success guides, give examples of animals and plants that have been selectively bred by humans. How have they been ‘improved’?
  6. 6. Mutation <ul><li>These changes are called mutations and can occur </li></ul><ul><li>quite naturally. </li></ul><ul><li>A mutation can cause changes in an organisms appearance and characteristics (a mutant). </li></ul><ul><li>Sometimes an organisms genes or chromosomes </li></ul><ul><li>can change. </li></ul>Notes
  7. 7. Down’s Syndrome Use the class books to describe the cause and effects of Down’s Syndrome. Notes
  8. 8. Amniocentesis
  9. 9. Amniocentesis Using the class books, and the diagram provided, produce an information sheet explaining to expectant parents the technique of amniocentesis. This should include: - the diagram - what is being sampled - how the sample will be taken - what the results will show Notes
  10. 10. Useful Mutations <ul><li>Not all chromosome mutations are harmful. </li></ul><ul><li>In many crop plants the cells have extra sets of chromosomes due to a chromosome mutation. These plants are called ________. </li></ul><ul><li>This gives them a higher </li></ul><ul><li>yield, extra disease </li></ul><ul><li>resistance and hardiness </li></ul><ul><li>e.g ………………………….. </li></ul>polyploid diploid diploid Notes
  11. 11. Mutagenic Agents <ul><li>Naturally occurring mutations are rare. </li></ul><ul><li>Some mutations can be caused by mutagenic agents. </li></ul>Mutagenic agent Effect on cells Ionising radiation X-rays/ ultraviolet light Chemical mutagens (carcinogens) Notes
  12. 12. Summary Answer the questions on page 83 of the Success Guide in full sentences.

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