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Explain how genetic drift results in evolution.

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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Explain how genetic drift results in evolution.

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  1. 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.

  2. 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

  3. 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.

  4. 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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