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Title:

Natural Selection

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Natural Selection Antibiotic Resistance What is Antibiotic Resistance? Watch the Video Clip about tuberculosis in Russian prisons Why is the Russian prison system ... – PowerPoint PPT presentation

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Date added: 14 August 2019
Slides: 11
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Title: Natural Selection


1
Natural Selection
  • Antibiotic Resistance

2
What is Antibiotic Resistance?
  • Watch the Video Clip about tuberculosis in
    Russian prisons
  • Why is the Russian prison system considered
    ground zero in the fight against TB?

3
Virus vs. Bacteria
  • A virus is non-living, does not have organelles,
    and needs a host cell to reproduce
  • Bacteria are alive, have ribosomes, and can
    reproduce on their own

4
Antibiotics
  • Substances that kill
  • disease causing bacteria
  • Fifty years ago, scientists thought that
    antibiotics had eradicated certain bacterial
    infections
  • Now, we are seeing an increase in infectious
    disease

5
What is happening?
  • When antibiotics are used, MOST of the bacteria
    are killed.
  • Some of the bacteria have mutated and can survive
    even when the antibiotic is taken
  • They are resistant to the antibiotic

6
Mutation Review
  • How does a mutation occur?
  • The DNA sequence is changed in some way
  • An error occurs during
  • Replication
  • Transcription
  • Translation
  • When the bacteria reproduce, this mutation is
    passed on to the new bacteria

7
Natural Selection
  • The resistant bacteria are the only bacteria to
    survive after using antibiotics
  • They reproduce rapidly!
  • This creates an entire
  • colony of resistant bacteria
  • that will not be killed by
  • antibiotics

8
  • Natural Selection means the survival of the
    fittest
  • What does fittest mean?
  • Those organisms that can survive and reproduce
  • Adapted to the environment
  • The resistant bacteria are the fittest and
    survive and reproduce

9
  • If the weakest bacteria are killed first, and you
    stop taking your antibiotics after five days of a
    ten day course, what do you predict will happen
    to the population of bacteria in your body?

10
Antibiotic Resistance Activity
  • Follow the procedure on your lab paper to
    simulate what happens when antibiotics are not
    taken as prescribed
  • Record your data in Table 1 and graph the data
    when you are finished
  • Complete the analysis questions in your lab
    notebook
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