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Genetic%20Engineering

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Title: Genetic%20Engineering


1
Genetic Engineering
  • Chapter 13
  • Section 1

2
selective breeding
  • Humans use selective breeding, which takes
    advantage of naturally occurring genetic
    variation in plants, animals, and other
    organisms, to pass desired traits on to the next
    generation of organisms.
  • Nearly all domestic animalsincluding horses,
    cats, and farm animalsand most crop plants have
    been produced by selective breeding (test
    question)

3
Hybridization 
  • crossing dissimilar individuals to bring together
    the best of both organisms (test question)
  • are often hardier than either of the parents
  • Example combine the disease resistance of one
    plant with the food-producing capacity of another

4
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5
Inbreeding
  • To maintain the desired characteristics of a line
    of organisms (test question)
  • helps to ensure that the characteristics that
    make each breed unique will be preserved.
  • Example The many breeds of dogsfrom beagles to
    poodlesare maintained by inbreeding

6
Inbreeding
  • Although inbreeding is useful in retaining a
    certain set of characteristics, it does have its
    risks. Most of the members of a breed are
    genetically similar. Because of this, there is
    always a chance that a cross between two
    individuals will bring together two recessive
    alleles for a genetic defect (test question)

7
Producing New Kinds of Bacteria
  • Breeders can increase the genetic variation in a
    population by inducing mutations, which are the
    ultimate source of genetic variability.
  • It has even been possible to produce bacteria
    that can digest oil and that were once used to
    clean up oil spills. (Today, naturally occurring
    strains of oil-digesting bacteria are used to
    clean up oil spills.)

8
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9
Assignment
  • Page 321
  • 1- 5
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