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The Essence of Life
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Blending Inheritance A great idea if you IGNORE the data. n The Basic Idea of Blending Inheritance 1) Sex cells still contain the "essence of the parents". 2) Offspring represent a mixture of the "essence"of each parent Example: Cross pollinate a red flower with a white flower and you get a pink flower Example: Cross pollinate a human female with a human male …….and you get?
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Ru Paul So much for the brilliant idea of blending inheritance!
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Gregor Mendel 1856 A monk with no social life but a good scientific mind. n Mendel's improved approach to understanding inheritance: 1) Studied clear cut (non-ambiguous) traits in pea plants, e.g. seed color, seed shape, stem height etc. 2) Studied traits in pea plants that were"true breeding", i.e. after extensive self-pollination, offspring have the same traitsas the parents. 3) He COUNTED the results of his crosses with different pea plants.
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Mendel's Experiment Cross plants that breed true for tall stems with plants that breed true for dwarf stems X Parent Plants F 1 Generation
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Mendel's Next Experiment Cross the F 1 generation plants with each other (Note: With humans, this is illegal in most states) X F1Generation F2Generation
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Mendel's Conclusions Based on counting thousands pea plants. (Remember he had no social life.) n Blending inheritance was a bogus idea n Heredity, therefore, was "particulate". n Each plant had two of these hereditary "particles", "alleles" or "genes". n Sex cells contain only one of the two hereditary "particles". The selection of which hereditary particle makes it into each sex cell is random..
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Mendel's Experiment True breeding plants DDddGenotype Phenotype Tall Dwarf D D d d
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Mendel's Experiment F1 Generation Genotype = Dd Phenotype = Tall F1 Generation Genotype = Dd Phenotype = Tall D d
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Mendel's Experiment D D d d 50/50 F1 Generation Genotype = Dd Phenotype = Tall F1 Generation Genotype = Dd Phenotype = Tall
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F1 Generation Cross D d D D d D d d Dd dd DD Dd Dd X Dd
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When the Data Don't Quite Fit, Ignore Them! The Expected Outcome for Genetic Inheritance that Follows Mendelian Ratios Parent #1 Breeds True for Red Flowers Parent #2 Breeds True for White Flowers X F1 Generation are all either Red (if red is dominant) or all White (if white is dominant).) F2 Generation show a 3:1 ratio F2 Generation show a 3:1 ratio of Dominant to Recessive Phenotype
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You Know It's Going to be a Bad Gene Day When... Parent #1 Breeds True for Red Flowers Parent #2 Breeds True for White Flowers X F 1 Generation were all Pink Generation were all Pink F 2 Generation showed a 1:2:1 ratio Generation showed a 1:2:1 ratio of Red to Pink to White! Mendel's Solution to this Problem? "I just won't think about this now. I'll think about this tomorrow. After all, tomorrow is another day. " XX
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Partial Dominance Parent #1 Breeds True for Red Flowers Parent #2 Breeds True for White Flowers X F 1 Generation were all Pink Generation were all Pink F 2 Generation showed a 1:2:1 ratio Generation showed a 1:2:1 ratio of Red to Pink to White! RRR'R' RR' RR : RR' : R'R' XX
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Customized Phenotype Genetic Engineering
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Genetic Engineering - NOT! 5' CCGC 3' GG OH P 5' CCGC OH P GG 3' 3' GG P OH CGCC 5' Shark DNA What is the result of ligating DNA from two different species? 5' CCGC OH P GG 3' 3' GG P OH CGCC 5' Tomato DNA OH CGCC 5' GG 3' P
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Food for the Planet (Beyond The Joy of Chemistry) The Biotech Revolution The Biotech Revolution Gains in agricultural production thanks to the introduction of: Genetically Engineered Life. Pest and Herbicide Resistance Increased Yield and Longer Shelf Life Drought and Cold Resistance Flavor and Nutritional Content Vaccine Production
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Less Pesticides for Safer Agriculture The Cotton Boll Worm is just one of the reasons cotton production consumes more agrochemicals than any crop on Earth.
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Natural Cotton Genetically Engineered Cotton Genetically engineered cotton reduces insecticide use.
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Transgenic BT Cotton Pest Resistant thanks to Bacillus thuringiensis Wild Type “Natural” Cotton BT “Engineered” Cotton
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Transgenic BT Corn Pest Resistant thanks to Bacillus thuringiensis Wild Type “Natural” Corn BT “Engineered” Corn
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ACC Oxidase Gene Knockout Slower Ripening with Higher Nutritional Content Natural Cantaloupe 60 days old Engineered Cantaloupe 60 days old
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Ethylene Receptor Knockout Plants do not Ripen (vegetables) or wilt (flowers) Genetically Engineered Tomato Natural Tomato Genetically Engineered Flower Natural Flower 100 Days8 Days
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Potatoes genetically engineered to produce human vaccines enable third world farmers to immunize people even where health care is otherwise nonexistent.
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The Biotech Revolution Doesn't Stop With the Green Giant
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Dangerous bacteria can be genetically programmed to target and kill cancer cells.
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Genetically Engineered Cancer Drugs (Endostatin) Blood Vessels in Healthy Tissue Blood Vessels in Cancerous Tissue Endostatin starves cancers by preventing the growth of new blood vessels.
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Endostatin Treated Untreated
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Cloning
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Cloned Goats Produce Human Anti-thrombin III in their Milk (To Treat Coagulation Disease)
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Transgenic Goat Chromosomes Blue dots are Human Anti-Thrombin III Genes on Goat Chromosomes
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When will WE be Cloned?
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Clones Already Walk Among Us
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We have the Technology
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Embryo Screening
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The Leading Edge of Genetic Technology
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Contact Information Phillip B. Danielson University of Denver Department of Biological Sciences 2101 E. Wesley Avenue Rm. 211 Denver, CO 80210 Email: pdaniels@du.edu Tel: (303) 871-3561 Thank you for your attention. Any questions? C’est Fini
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