State Standard
SB5E. Recognize the role of evolution to biological resistance (pesticide and
antibiotic resistance)
Biological Resistance (15.2)
Antibiotic Resistance
Bacteria reproduce quickly and their population grows rapidly.
Mutations can lead to traits that allow certain individuals to be immune to antibiotics.
These survivors then reproduce quickly (cloning themselves) and establish a population of antibiotic resistant bacteria.
15.3 Natural Selection-Speciation-Resistance
Chapter 15
Antibiotic Resistance Cont’d
15.3 Natural Selection-Speciation-Resistance
Ch. 15
Antibiotic Resistance Cont’d
The overuse of antibiotics has caused antiobiotic-resistant populations of bacteria to become a dangerous problem.
Methicillin-resistant Staphylococcus aureus (MRSA) is a bacterium that causes infections in different parts of the body. It's tougher to treat than most strains of staphylococcus aureus -- or staph -- because it's resistant to some commonly used antibiotics
15.3 Natural Selection-Speciation-Resistance
Ch. 15
Antibiotic Resistance Cont’d
15.3 Natural Selection-Speciation-Resistance
Ch. 15
Typical appearance of MRSA infection
Pesticide Resistance Pesticides may kill most members of an insect
population, but variation allows some individuals to be immune to pesticides.
Those who are immune are able to survive and reproduce, passing their immunity trait to the next generation.
Soon, a whole population of pesticide-resistant insects is thriving.
15.3 Natural Selection-Speciation-Resistance
Ch. 15
Pesticide Resistance
15.3 Natural Selection-Speciation-Resistance
Ch. 15
• Overuse of pesticides has allowed more and more resistant populations to develop.
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