Advances in Genetics
Chapter 5, Section 3
Genetic Engineering
• What is a gene again?
• Section of the DNA located in a chromosome that directs the activities of a cell.
Genetic Engineering
• What is genetic engineering?
• Biological or chemical ways to change the arrangement of DNA in a gene.
Genetic Engineering
• What is genetic engineering used for?
• Produce medicines• Change the functions of
cells• Improve crops
Genetic Engineering
• Recombinant DNA
• Inserts a section of DNA from an organism into a bacterium.– Examples:
• Production of insulin and growth hormone.
Genetic Engineering
• Gene Therapy• Normal alleles are inserted into a virus.
• Virus infects a target cell.• Normal allele replaces the
defective allele in the target cell.
Genetic Engineering
• Selective Breeding
• Selecting plants or animals to breed together based on desired traits.
• Has been practiced for thousands of years.
Genetic Engineering
• Genetically Engineered Plants
• Desired genes from one plant are inserted into a different plant.
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