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Ch 13 Genetics and Biotechnology

Ch 13 Genetics and Biotechnology . SC.912.L.16.10. Evaluate the impact of biotechnology on the individual, society and the environment, including medical and ethical issues. Section 1 Applied Genetics. page 143 Vocabulary: 1. selective breeding, 2. Inbreeding 3. Test cross.

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Ch 13 Genetics and Biotechnology

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  1. Ch 13 Genetics and Biotechnology

  2. SC.912.L.16.10 • Evaluate the impact of biotechnology on the individual, society and the environment, including medical and ethical issues.

  3. Section 1 Applied Genetics • page 143 Vocabulary: • 1. selective breeding, • 2. Inbreeding • 3. Test cross

  4. selective breeding • when the plants/animals from the existing stock that have the characteristics they want are selected and are allowed to breed. Uses: * High yielding crops, such as wheat are produced by collecting the seeds from only the plants that have a good yield of wheat.                   * Disease resistant crops can be developed.                   * Animals on farms are bred so that they produce more food, e.g. cows with better meat, hens that lay more eggs.                   * Animals such as dogs and cats are bred for fashion. They may also be bred to do a particular job (e.g. sheepdogs).                  

  5. Disadvantage: • There are many ethical concerns where people claim that we are 'acting as God' and it is somehow immoral. There is also the risk of mutation which could lead to unwanted consequences.

  6. Impact on society: • The impact on society will depend on to the extent of where the manipulation of plants and animals is taken. If it is generally mild, the majority of society may accept it, however there are also ethical issues involved and religious groups could be strongly against it.

  7. Inbreeding reproduction from the mating of two genetically related parents, which can increase the chances of offspring being affected by recessive traits.

  8. Test cross • the cross of an organism with an unknown dominant genotype with an organism that is homozygous recessive for that trait

  9. 1. The process of breeding plants and animals to have desired traits is known as _____________________ • 2. Examples of this are things like: ________________________________________________________ • 3. Organisms whose parents have different forms of a trait are known as what? _____________________ • 4. Selective breeding can be done between 2 closely related organisms and is called _________________ • 5. What is a disadvantage of this process? ___________________________________________________ • 6. When a test cross is done it is done to determine the _________________________________of one organism by crossing it with an organism whose genotype is known and is __________________________. • 7. If the example of a white grapefruit is used like in the book, what results would indicate that the parent white grapefruit is heterozygous? __________________________________________________________

  10. 1. The process of breeding plants and animals to have desired traits is know as • SELECTIVE BREEDING _ • 2. Examples of this are things like: • PURE BREED DOGS, PLANTS WITH A SPECIFIC TASTE,OR RESISTANT TO DISEASE. • 3. Organisms whose parents have different forms of a trait are known as what? • HYBRIDS • 4. Selective breeding can be done between 2 closely related organisms and is called INBREEDING

  11. 5. What is a disadvantage of this process? HARMFUL TRAITS CAN BE PASSED ON • 6. When a test cross is done it is done to determine the GENOTYPE of one organism by crossing it with an organism whose genotype is known and is HOMOZYGOUS RECESSIVE. • 7. If the example of a white grapefruit is used like in the book, what results would indicate that the parent white grapefruit is heterozygous? ½ OF THE OFFSPRING WOULD BE WHITE AND ½ WOULD BE RED IF THE PARENT WAS HETEROZYGOUS AND NOT HOMOZYGOUS

  12. Genetics review!

  13. Section 2 DNA Technology • page 146 Vocabulary: • 1. Genetic engineering • 2. Restriction enzyme • 3. Recombinant DNA • 4. Plasmid • 5. Cloning • 6. Transgenic organism

  14. Genetic engineering • 1. What is genetic engineering? • A WAY TO MANIPULATE DNA BY INSERTING EXTRA DNA OR DNA FROM ANOTHER ORGANISM

  15. Genetic Engineering Genetic engineers manipulate DNA for practical purposes. Restriction enzymes cleave DNA into fragments that have short sticky ends. Sticky ends allow DNA fragments from different organisms to join together to form recombinant DNA. 2. What is the name for all of the DNA present in the nucleus of a cell? GENOME

  16. Restriction enzyme • proteins made by bacteria that can cut DNA at specific places

  17. 4. What is the benefit of the “sticky ends” left by restriction enzymes? THEY ALLOWOTHER FRAGMENTS OF DNA WITH THE SAME STICKY ENDS TO JOIN TOGETHER • 5. When fragments of DNA from one source are combined with those from another source what is this new DNA called? • RECOMBINANT DNA

  18. Recombinant DNA • DNA made from combining DNA from 2 or more different sources.

  19. Plasmid • A small circular, double stranded DNA molecule found in bacterial cells used as a vector to get recombinant DNA into a host cell.

  20. 7. In order to get the recombinant DNA into the host cell a vector is needed, a PLASMID is a small circular piece of DNA that can be cut with restriction enzymes and then the gene can be inserted and joined with DNA ligase. • 8. The plasmid gets into the bacterial cell by TRANSFORMATION when the cell is heated or shocked electrically.

  21. Cloning • When the bacterial cell copies its own DNA it also copies the plasmid and any recombinant DNA inserted in the plasmid. This is called cloning the DNA. • Multiple copies of the DNA can be made this way. • 6. Bacteria are often the host cell for doing what to the new DNA? COPY IT/clone it! • 9. Bacteria will copy the plasmid along with their own DNA and this is how CLONING occurs.

  22. PCR • PCR (polymerase chain reaction) is a method to analyze a short sequence of DNA (or RNA) even in samples containing only minute quantities of DNA or RNA. PCR is used to reproduce (amplify) selected sections of DNA or RNA.

  23. PCR Animation • http://users.ugent.be/~avierstr/principles/pcrani.html • Denaturation: At 94 C (201.2 F), the double-stranded DNA melts and opens into two pieces of single-stranded DNA. • Annealing: At medium temperatures, around 54 C (129.2 F), the primers pair up (anneal) with the single-stranded "template" (The template is the sequence of DNA to be copied.) On the small length of double-stranded DNA (the joined primer and template), the polymerase attaches and starts copying the template. • Extension: At 72 C (161.6 F), the polymerase works best, and DNA building blocks complementary to the template are coupled to the primer, making a double stranded DNA molecule

  24. 10. When a scientist mixes an unknown sample of DNA with DNA polymerase and tagged A,C,G and T what are they trying to do? DETERMINE THE SEQUENCE OF THE DNA • 11. PCR stands for what? POLYMERACE CHAIN REACTION • 12. What does PCR do? MAKE MILLIONS OF COPIES OF A SPECIFIC REGION OF A DNA FRAGMENT

  25. 6. Transgenic organism • Organisms that have had genes from other species inserted into their genome • . • There are ethical and health concerns regarding this practice… • GMO: An organism whose genetic characteristics have been altered by the insertion of a modified gene or a gene from another organism using the techniques of genetic engineering.

  26. 13. What is a transgenic organism? ORGANISMS THAT HAVE A GENE FROM A DIFFERENT ORGANISM INSERTED INTO THEIR DNA. • 14. Are there transgenic animals? YES_ Give an example _GOATS WITH PROTEINS TO STOP BLOOD CLOTTING. FISH TO GROW FASTER. • 15. What are some of the transgenic uses for plants? 1. Cotton_RESISTANT TO BOWEEVILS. • 2. rice: WITH INCREASED NUTRIENTS • 16. What are some of the uses for transgenic bacteria? TO MAKE INSULIN, GROWTH HORMONES AND MEDICAL SUBSTANCES.

  27. Virtual lab on biotechnology • http://www.montereyinstitute.org/courses/AP%20Biology%20I/course%20files/multimedia/chapter9virtuallab02/lessonp.html

  28. 2. What is the name for all of the DNA present in the nucleus of a cell? ____________________________ • 3. What are proteins made by bacteria that can cut DNA at specific places called? ____________________ • 4. What is the benefit of the “sticky ends” left by restriction enzymes? _____________________________ • 5. When fragments of DNA from one source are combined with those from another source what is this new DNA called? ________________________________________

  29. 6. Bacteria are often the host cell for doing what to the new DNA? _____________________________ • 7. In order to get the recombinant DNA into the host cell a vector is needed, a ___________________is a small circular piece of DNA that can be cut with restriction enzymes and then the gene can be inserted and joined with DNA ligase. • 8. The plasmid gets into the bacterial cell by _____________________________when the cell is heated or shocked electrically. • 9. Bacteria will copy the plasmid along with their own DNA and this is how ___________________occurs. • 10. When a scientist mixes an unknown sample of DNA with DNA polymerase and tagged A,C,G and T what are they trying to do?

  30. 11. PCR stands for what? _______________________________________________________________ • 12. What does PCR do? _________________________________________________________________ • 13. What is a transgenic organism? ________________________________________________________ • 14. Are there transgenic animals? _______ Give an example ____________________________________ • 15. What are some of the transgenic uses for plants? 1. Cotton____________________________________ • 2. rice ________________________________________ • 16. What are some of the uses for transgenic bacteria?

  31. SECTION 2 ANSWERS • 1. What is genetic engineering? A WAY TO MANIPULATE DNA BY INSERTING EXTRA DNA OR DNA FROM ANOTHER ORGANISM • 2. What is the name for all of the DNA present in the nucleus of a cell? GENOME • 3. What are proteins made by bacteria that can cut DNA at specific places called? RESTRICTION ENZYMES • 4. What is the benefit of the “sticky ends” left by restriction enzymes? THEY ALLOWOTHER FRAGMENTS OF DNA WITH THE SAME STICKY ENDS TO JOIN TOGETHER • 5. When fragments of DNA from one source are combined with those from another source what is this new DNA called? RECOMBINANT DNA • 6. Bacteria are often the host cell for doing what to the new DNA? COPY IT

  32. 7. In order to get the recombinant DNA into the host cell a vector is needed, a PLASMID is a small circular piece of DNA that can be cut with restriction enzymes and then the gene can be inserted and joined with DNA ligase. • 8. The plasmid gets into the bacterial cell by TRANSFORMATION when the cell is heated or shocked electrically. • 9. Bacteria will copy the plasmid along with their own DNA and this is how CLONING occurs. • 10. When a scientist mixes an unknown sample of DNA with DNA polymerase and tagged A,C,G and T what are they trying to do? DETERMINE THE SEQUENCE OF THE DNA • 11. PCR stands for what? POLYMERACE CHAIN REACTION • 12. What does PCR do? MAKE MILLIONS OF COPIES OF A SPECIFIC REGION OF A DNA FRAGMENT • 13. What is a transgenic organism? ORGANISMS THAT HAVE A GENE FROM A DIFFERENT ORGANISM INSERTED INTO THEIR DNA. • 14. Are there transgenic animals? YES_ Give an example _GOATS WITH PROTEINS TO STOP BLOOD CLOTTING. FISH TO GROW FASTER. • 15. What are some of the transgenic uses for plants? 1. Cotton_RESISTANT TO BOWEEVILS. • 2. rice: WITH INCREASED NUTRIENTS • 16. What are some of the uses for transgenic bacteria? TO MAKE INSULIN, GROWTH HORMONES AND MEDICAL SUBSTANCES.

  33. Section 3 The human Genome • page 152 vocabulary: • 1. DNA fingerprinting • 2. Gene therapy • 3. Pharmacogenomics • 4. Genomics

  34. The Human Genome Project was an effort to determine the nucleotide sequence of and map the location of every gene on each human chromosome by the year 2003. • It was determined that only 2% of the DNA coded for proteins!! The remaining 98% was called noncoding sequences and was found to be the DNA unique to individuals.

  35. DNA fingerprinting • The use of gel electrophoresis to identify sections of DNA that are unique to an individual. • Nova DNA virtual lab • http://www.teachersdomain.org/asset/tdc02_int_creatednafp2/

  36. Gel electro virtual lab • http://learn.genetics.utah.edu/content/labs/gel/

  37. Electrophoresis uses an electric field within a gel to separate DNA fragments by their size. • .

  38. Gene therapy • A way of fixing mutated genes by inserting normal genes to replace the mutated ones. • Human Genome project link • http://www.ornl.gov/sci/techresources/Human_Genome/project/about.shtml • Researchers also are experimenting with introducing a 47th (artificial human) chromosome into target cells. This chromosome would exist autonomously alongside the standard 46 --not affecting their workings or causing any mutations. It would be a large vector capable of carrying substantial amounts of genetic code, and scientists anticipate that, because of its construction and autonomy, the body's immune systems would not attack it. A problem with this potential method is the difficulty in delivering such a large molecule to the nucleus of a target cell.

  39. What factors have kept gene therapy from becoming an effective treatment for genetic disease? • Short-lived nature of gene therapy - Before gene therapy can become a permanent cure for any condition, the therapeutic DNA introduced into target cells must remain functional and the cells containing the therapeutic DNA must be long-lived and stable. Problems with integrating therapeutic DNA into the genome and the rapidly dividing nature of many cells prevent gene therapy from achieving any long-term benefits. Patients will have to undergo multiple rounds of gene therapy. • Immune response - Anytime a foreign object is introduced into human tissues, the immune system is designed to attack the invader. The risk of stimulating the immune system in a way that reduces gene therapy effectiveness is always a potential risk. Furthermore, the immune system's enhanced response to invaders it has seen before makes it difficult for gene therapy to be repeated in patients. • Problems with viral vectors - Viruses, while the carrier of choice in most gene therapy studies, present a variety of potential problems to the patient --toxicity, immune and inflammatory responses, and gene control and targeting issues. In addition, there is always the fear that the viral vector, once inside the patient, may recover its ability to cause disease. • Multigene disorders - Conditions or disorders that arise from mutations in a single gene are the best candidates for gene therapy. Unfortunately, some the most commonly occurring disorders, such as heart disease, high blood pressure, Alzheimer's disease, arthritis, and diabetes, are caused by the combined effects of variations in many genes. Multigene or multifactorial disorders such as these would be especially difficult to treat effectively using gene therapy. For more information on different types of genetic disease, see Genetic Disease Information. • http://www.ornl.gov/sci/techresources/Human_Genome/medicine/genetherapy.shtml

  40. Ethical questions about gene therapy • What is normal and what is a disability or disorder, and who decides? • Are disabilities diseases? Do they need to be cured or prevented? • Does searching for a cure demean the lives of individuals presently affected by disabilities? • Is somatic gene therapy (which is done in the adult cells of persons known to have the disease) more or less ethical than germline gene therapy (which is done in egg and sperm cells and prevents the trait from being passed on to further generations)? In cases of somatic gene therapy, the procedure may have to be repeated in future generations. • Preliminary attempts at gene therapy are exorbitantly expensive. Who will have access to these therapies? Who will pay for their use?

  41. . The Food and Drug Administration (FDA) has not yet approved any human gene therapy product for sale. Current gene therapy is experimental and has not proven very successful in clinical trials. Little progress has been made since the first gene therapy clinical trial began in 1990. According to the human genome project web site! • . http://www.ornl.gov/sci/techresources/Human_Genome/medicine/genetherapy.shtml#status

  42. Pharmacogenomics • Pharmacogenomics is the study of how an individual's genetic inheritance affects the body's response to drugs. • The term comes from the words pharmacology and genomics and is thus the intersection of pharmaceuticals and genetics.

  43. What are the anticipated benefits of pharmacogenomics? • More Powerful MedicinesPharmaceutical companies will be able to create drugs based on the proteins, enzymes, and RNA molecules associated with genes and diseases. This will facilitate drug discovery and allow drug makers to produce a therapy more targeted to specific diseases. This accuracy not only will maximize therapeutic effects but also decrease damage to nearby healthy cells. • Better, Safer Drugs the First TimeInstead of the standard trial-and-error method of matching patients with the right drugs, doctors will be able to analyze a patient's genetic profile and prescribe the best available drug therapy from the beginning. Not only will this take the guesswork out of finding the right drug, it will speed recovery time and increase safety as the likelihood of adverse reactions is eliminated. Pharmacogenomics has the potential to dramatically reduce the the estimated 100,000 deaths and 2 million hospitalizations that occur each year in the United States as the result of adverse drug response (1). • More Accurate Methods of Determining Appropriate Drug DosagesCurrent methods of basing dosages on weight and age will be replaced with dosages based on a person's genetics --how well the body processes the medicine and the time it takes to metabolize it. This will maximize the therapy's value and decrease the likelihood of overdose.

  44. Advanced Screening for DiseaseKnowing one's genetic code will allow a person to make adequate lifestyle and environmental changes at an early age so as to avoid or lessen the severity of a genetic disease. Likewise, advance knowledge of a particular disease susceptibility will allow careful monitoring, and treatments can be introduced at the most appropriate stage to maximize their therapy. • Better VaccinesVaccines made of genetic material, either DNA or RNA, promise all the benefits of existing vaccines without all the risks. They will activate the immune system but will be unable to cause infections. They will be inexpensive, stable, easy to store, and capable of being engineered to carry several strains of a pathogen at once • Source: http://www.ornl.gov/sci/techresources/Human_Genome/medicine/pharma.shtml

  45. 4. Genomics • The study of the organism’s genome. Understanding all of the genes and how they work.

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