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Genetic Engineering Chapter

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					Chapter 13
What is genetic engineering?
 Genetic Engineering =
 Using knowledge about
 genetics to create more
 desirable offspring.
Genetic Engineering in History
         Selective Breeding describes how
         humans have used knowledge about traits
         and genetic inheritance to breed desirable
         offspring.
           Example 1: If you want a dog that will
            retrieve things and act as a good guard dog,
            you could cross a Golden Retriever with a
            Doberman.

           Example 2: If you want a better type of corn,
            you could cross breed two types of corn so
            that the offspring tastes good and is
            resistant to pesticides.
Recombinant DNA
 All living things have DNA, and all
  DNA has the same structure.

 It is possible to cut and paste pieces
  of DNA from different species to
  give organisms more desirable
  traits. This is called recombinant
  DNA.
How does recombinant DNA work?
 A piece of DNA from an organism is selected. This
 usually represents some type of desirable trait.

 A restriction enzyme cuts that piece of DNA from
 the genome of the first organism. Then the genome of
 the second organism is cut open.

 DNA ligase glues the cut pieces together (“sticky
 ends”) to form a new piece of recombinant DNA.
How does recombinant DNA work?
Other Examples of Genetic
Engineering
 Stem Cell Research       Resurrecting Extinct
 Cloning                   Animals
 Genetically Modified     Genetic Testing
  Foods                    Savior Siblings
 Transgenic Plants and    Designer Babies
  Animals

				
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