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Topic 7.7:

Continuing Evolution

General reminders post it

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Template Design- Anne Price

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7.8: Continuing Evolution

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ENDURING UNDERSTANDING

EVO-3 Life continues to evolve within a changing environment

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LEARNING OBJECTIVE

EVO-3.A Explain how evolution is an ongoing process in all living organisms.

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ESSENTIAL KNOWLEDGE

EVO-3.A.1 Populations of organisms continue to evolve. EVO-3.A.2 All species have evolved and continue to evolve—

a. Genomic changes over time.

b. Continuous change in the fossil record.

c. Evolution of resistance to antibiotics, pesticides, herbicides, or chemotherapy drugs.

d. Pathogens evolve and cause emergent diseases.

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What will we learn?

  1. How has it been determined that all life has evolved and continues to evolve?
  2. How does resistance contribute to evolution?
  3. How do pathogens contribute to the evolution of other populations?

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7.8: Continuing Evolution

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Life continues to evolve within a changing environment.

Evolution is an ongoing process in all living organisms.

  • Populations of organisms continue to evolve.

Give an example of evolution:

Continuous change in the fossil record is evidence of continued evolution.

Explain how fossils provide evidence of organism that lived in the past.

How do fossils indicate changes in the environment?

Do fossil records offer a complete chronicle of evolutionary change?

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7.8: Continuing Evolution

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Resistance to various chemicals has resulted in species evolution.

Evolution of resistance to chemicals can become evident through natural selection.

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Where does a resistant trait come from?

Explain how the resistant trait increases in frequency over time.

What are other examples that support the evolution of resistance?

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7.8: Continuing Evolution

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Pathogens evolve and cause emergent diseases.

What is a pathogen?

How is diversity increased in pathogens?

Explain how pathogens coevolve with the host?

Two examples are given in the video. Explain with details each of these examples.

2009 Swine Flu Pandemic

Covid-19 Pandemic

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7.8: Continuing Evolution

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Let’s Practice: Questions and Methods

A group of researchers noticed that using a particular drug to treat cancer in mice would reduce the size of the tumor. Some of the tumor cells appeared to be resistant to the drug since some of the cells would increase in number over time. The researchers wish to increase the reliability of their experimental observations.

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Which of the following proposes a next step researchers might take to increase the reliability o their experimental observations?

Your answer:

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How did you do? Explain the correct answer if you got it wrong.

KEY TAKEAWAYS

  1. Evidence of genomic changes within a population over time provides evidence that all life has evolved and continues to evolve.

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  • The evolution of resistance to antibiotics, pesticides, herbicides, and chemotherapy drugs leads to a species’ evolution.

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  • As pathogens evolve, the phenotypes selected for and against in host populations can change over time.

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