Download 7th grade Origin of Species PPT 6 Origin of Species PP 2016

Origin of Species
Origins of Species
3-25-15
Key Question: What role do mutations play in
natural selection?
Initial Thoughts:
Evidence 2: PBS Movies
• http://www.pbs.org/wgbh/evolution/educato
rs/teachstuds/svideos.html
• Watch: Video 3: How do we know evolution
happens?
• Watch: Video 4: How does evolution really
work?
• Watch: Video 6: Why does evolution matter
now?
Analysis Questions
1. Are mutations always helpful? Explain.
2. How can mutations enable the evolution of a
new species to occur?
3. Under ideal conditions, bacteria have a
generation time of about 20 minutes. Humans
have a generation time of about 20 years.
Which would you expect to evolve faster?
Summary
• What did you think about the role mutations
play in natural selection before this lesson?
• What did you learn about the role mutations
play in natural selection from this lesson?
(Minimum of 3 sentences!!!)
• What are some further thoughts or questions
you have about how the role mutations play in
natural selection?
Reflection
Darwin identified 14 species of finch on the
Galapagos Islands. Your friend says that this
means only 14 mutations occurred within the
finch populations. Explain whether you agree
with your friend and why.
Big Idea