CellCraft (Fabien) Concepts in Biochemistry - Interactive Animations. Cell Game- Anatomy - Health and Science (Fabien) LEA Serious game OGM tiltfactor >> PROFITSEED. LEA Genetically Modified Foods. Can you think of some possible risks of growing plants that contain genes from other organisms?
Let's examine our earlier examples: the beetle-resistant tomato, the vaccination banana, and the saltwater rice plant. We've already covered the potential advantages of these plants, but what are the concerns? Cross-breeding with wild populations. For all of these examples, a primary concern is preventing genetically modified versions from mixing with the naturally existing populations of plants from which they're derived.
Plants rely on the transfer of pollen, via insects or the air, to breed and produce offspring, and it's difficult to control how they cross-breed in the wild. In most cases, it's not yet clear how introduction of the non-native gene would affect wild populations. Toxicity or allergic reactions. When farmers start growing genetically modified crops, they stop growing the old varieties. LEA Selective Breeding. 13-1 Changing the Living World Selective Breeding Takes advantage of naturally occurring genetic variation in organisms & passes them on to next generation Most domestic animals & crops have been produced this way (horses, cats, Burbank, potato) Humans use this to pass desired traits on to the next generation of organisms Hybridization = crossing dissimilar individuals to bring together the best traits of both organisms Produces hybrids - which are often hardier than parents Hybrids have combined/desired traits of both parents Inbreeding = continued breeding of individuals with similar characteristics to maintain the desired characteristics of a line (ex. pure breed golden retriever) Has risks… increases breed's susceptibility to disease & deformities Increasing Variation Breeders can increase variation in a population by inducing mutations Mutation = any change in DNA Mutations occur spontaneously, but rate can be increased through radiation & chemicals Techniques are used to: 1. 2. 3. 4.
ALISON Recombinant DNA Technology and Transgenic Animals. Discover the latest on health research. Xplore Health Discover the latest on health research advanced search Home › The biotechnology revolution › Plants to farm drugs The biotechnology revolution Plants to farm drugs.
LEA Transgenic Mice. What's The Motivation?
As a child, Capecchi wandered homeless in Italy. As a researcher, his first attempts at gene targeting were deemed not ready for funding by the National Institutes of Health. Capecchi is an individual whose personal life proves that while some events are not probable, anything is possible. Read Mario's story. During the 1980s, Capecchi devised a way to change or remove any single gene in the mouse genome, creating strains of mice that pass the altered gene from parent to offspring. Capecchi's pioneering work in gene targeting has taught us much about how the body builds—and rebuilds—itself. And he has raised a key question for the future of human medicine: if we can replace a perfectly good gene with a mutated one, can we also go the other way, replacing problem genes with those that work? Rosalind Franklin: Biography & Discovery of DNA Structure (Fabien)
Many people recall that the structure of the DNA molecule has the shape of a double helix.
Some may even recall the names of the scientists who won the 1962 Nobel Prize in Medicine for modeling the structure of the molecule, and explaining how the shape lends itself to replication. James Watson and Francis Crick shared the Nobel Prize with Maurice Wilkins, but many people feel that much of the credit for this world-shaking achievement should rightfully go to someone who was absent from that stage, a woman named Rosalind Franklin. Rosalind Franklin was born July 25, 1920, and grew up in a well-known Jewish family in pre-World War II London, and was known in the family for being very clever and outspoken.
Her parents sent her to St. Paul’s Girls’ School, a private school known for rigorous academics, including physics and chemistry. “She was best in science, best at maths, best in everything. Around this time, Franklin and Gosling made a startling discovery. Les lapins et les drosophiles au service de la génétique. Jouer avec les molécules pour déterminer une parenté sur le web. Recommandation didactique (Bernard Gissot IA-IPR de SVT) Comme dans toute progression pédagogique et afin de respecter la « démarche de résolution de problèmes » indispensable à la formation scientifique de l’élève, ces fiches ne peuvent être utilisées que dans le cadre de cette méthode.
Autrement dit, cette séance ne peut se situer dans la démarche que dans une phase de mise à l’épreuve expérimentale. Elle fait donc obligatoirement suite à l’énoncé d’une problématique et à la proposition d’hypothèses de résolutions formulées par les élèves. Ces dernières seront alors validées ou invalidées par la saisie de données scientifiques proposées par le site . Ces fiches ne peuvent en aucun cas être distribuées de façon directive mais seulement comme une trame possible à un protocole d’activité de validation scientifique. Point de départ Le site de départ est celui du NCBI : Premier temps : Recherche d’une protéine d’une espèce donnée Par exemple, si on saisit cat :