Presentation on theme: "Biotechnology. Selective Breeding Nonrandom mating to select for characteristics in parents that are desired in the offspring. Eg. Breeding domestic animals,"— Presentation transcript:
Genetic Engineering Direct manipulation of genes to alter hereditary traits. Advances in technology have enabled scientists to use several different techniques to study and alter DNA sequences.
Restriction Enzymes Discovered in bacteria. Enzymes cut the DNA at short, specific sequences. Some restriction enzymes cut the DNA leaving strands that over hang called “sticky ends” For example : G A A T T C C T T A A G
Recombinant DNA Scientists can use sticky ends to join together segments of DNA from two different organisms, which is called recombinant DNA. Foreign DNA is put into a plasmid, a circular piece of DNA found in bacteria.
plasmid Enzymes cut plasmid and foreign DNA The desired DNA segment is inserted into the plasmid. Foreign DNA Plasmid with foreign DNA
Transgenic organisms The plasmid with the new DNA can be inserted into a new organism. This is creates a transgenic organism
Agricultural uses: genetically modified organisms (GMO) To give crops disease/ drought resistance, add nutrients, etc Flavr Savr tomato: modified to ripen slower Golden rice: rice with added genes to make Vitamin A
Medical uses: Gene therapy Genetic diseases are often caused by genes that do not function properly. Scientists can add a functioning gene into a plasmid and insert it into the patient. Testing treatment for Cystic Fibrosis- missing one gene.
Gel Electrophoresis Method used to separate DNA fragments based on their charge and size. 1. Create an agarose gel with wells at the top of each lane. 2. Add DNA samples into each well. 3. Electric current pulls DNA towards positive end of the gel.
DNA Fingerprinting A technique used to analyze DNA. Can compare or identify similarities between samples of DNA. Use enzymes to cut DNA samples into segments. Everyone has different length segments because of random repeated sequences.
Filter DNA through an agarose gel by the process called gel electrophoresis. Compare the pattern of the DNA bands. Matching lengths will appear at the same distance.