Objectives:
•Today we will…
–Review/finish speciation
–POGIL: Evolution and Selection
•So that we can…
–Use the process of natural selection to explain the
evolution of particular traits.
–Distinguish between natural and artificial
selection.
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Natural Selection and Speciation: Understanding the Evolution of Species, Study notes of Evolutionary biology
An overview of natural selection and speciation, with a focus on how new species form and the role of natural selection in shaping traits. Students will review the concept of speciation, participate in a POGIL activity to explore examples of natural and artificial selection, and consider the challenges of defining 'species'. The document also includes a review of pressures and adaptations, and a debrief on the evolution of dogs, wolves, and coyotes.
Typology: Study notes
2021/2022
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Objectives:
- Today we will…
- Review/finish speciation
- POGIL: Evolution and Selection
- So that we can…
- Use the process of natural selection to explain the evolution of particular traits.
- Distinguish between natural and artificial selection.
Bell Work:
**1) Please take out yesterday’s notes on speciation.
- Discuss: Which of the following is MOSTLY LIKELY to result in speciation?** a. Giraffes live in an environment with tall trees. Over time, they evolve to have longer and longer necks. b. Some birds from the mainland of South America get blown to an island by a storm. Over time, they adapt to the new island environment. c. Coyotes and wolves compete for survival. Over time, coyotes survive and wolves go extinct. d. The climate gradually gets warmer and the grassland habitats expand. Zebras live in the grasslands. Over time, the zebra population grows larger.
How do we know if a new species has formed?
If they have changed so much that they are no longer able to mate with each other and produce fertile offspring. àBehavioral differences à Physical differences à Genetic differences
However, it can be hard to apply this definition!
Exception: Ligers!
Not Applicable!
Our definition of “species” is not applicable
to bacteria and other organisms that
reproduce asexually.
Review: Pressures & Adaptations
Rabbits are eaten by foxes. Explain why rabbits who are faster are more likely to be survive. (Use the terms: variation, pressure, fit.)
Review: Pressures & Adaptations
Rabbits are eaten by foxes. Explain why rabbits who are faster are more likely to be survive. (Use the terms: variation, pressure, fit.)
POGIL: Evolution &Selection
- This POGIL will help you to work through a few more examples of natural selection & will introduce the similar idea of artificial selection.
- When you & your partner are BOTH ready for a stamp, please raise your hand.
- If you finish before the rest of your table, please help the others in your group.
Debrief POGIL:
Please describe the variation in the color of
these peppered moths…
Peppered Moths:
Their natural predator is birds.