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Explain how genetic drift results in evolution.

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Explain how genetic drift results in evolution. - PowerPoint PPT Presentation


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Explain how genetic drift results in evolution. Give two specific examples of natural selection. Explain how environmental changes triggered a change in your examples.

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slide1
Explain how genetic drift results in evolution.
  • Give two specific examples of natural selection. Explain how environmental changes triggered a change in your examples.
  • A scientist found two populations of very similar organisms. Design an experiment to determine if these populations belong to the same species or not. Determine the variables.
  • Explain how molecular evidence supports the concept of evolution.
  • Design a plan to investigate the claim that speciation occurred throughout the history of life on Earth.
slide2
Differentiate between allopatric and sympatric speciation. Describe a specific example of each.
  • The Galapagos Islands consist of a dozen islands close to each other. Each island has 1-11 of the 13 species of finches on it. Many biologists believe that if there would be only 1 island, there would be only 1 finch species.
    • How does the existence of the islands promote speciation? Explain
    • Is the mode of speciation that occurred on the islands more likely have been allopatric or sympatric? Explain
slide3
CO2 levels in Earth’s atmosphere have increased by about 40% since 1850. On a geologic time scale, that’s a dramatic change over a very short time. What were the effects of the oxygen revolution about 2.5 billion years ago? How might those relate to today’s problems with increasing CO2 in Earth’s atmosphere?
  • List two pieces of evidence that suggests that fish and humans have a common ancestor. Explain these.
  • Describe speciation in an isolated population and connect it to change in gene frequency, change in environment, natural selection and/or genetic drift.
slide4
Describe a specific hypothesis about the origin of organic molecules, macromolecules and cells on earth. Give at least one supporting evidence of each.
  • Why do you think it is necessary to revise hypothesesabout the history of life all the time?
  • Describe the conditions of the early earth. Provide evidence.
  • Analyze the sources and consequences of O2 release into the atmosphere.
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