2. Evolution

3. 100 200 400 300 400 Choice 1Choice 2Choice 3Choice 4 300 200 400 200 100 500 100

4. Row 1, Col 1 What is the first step in developing a model of natural selection? The initial population varies in many traits. Most individuals have one version of some traits.

5. 1,2 What are the 6 natural selection pressures? Overproduction, competition, variation, selection, environmental change, genes

6. 1,3 What is the second step of the natural selection model? Environmental change

7. 1,4 What is overproduction? When a species produces more offspring than could possibly survive. The best and strongest survive and pass on their genes.

8. 2,1 What is an environmental change? A change in the environment that can affect an organism’s ability to survive

9. 2,2 What are the 5 evidences used to prove the theory of evolution? Vestigial structure, homologous structure, genes/proteins, fossils, embryonic evidence

10. 2,3 What are the two rates of change that describe evolution? Punctuated equilibrium and gradualism

11. 2,4 When a rapid change occurs in evolution is it referred to as what? Punctuated equilibrium

12. 3,1 When organisms have a similar structure it means they share a common ancestor. This is an example of what type of evolutionary evidence? Homologous structure

13. 3,2 When members of the same species have differences in their traits, this is an example of ? Variation

14. 3,3 When individual organisms have a trait that makes them more likely to survive after an environmental change, they are called? Adventageous

15. 3,4 When body parts are reduced in size over time because they don’t seem to have a function, this is an example of what? Vestigial Structures

16. 4,1 What is the most accurate way for scientists to compare two species to find out how closely they are related? By comparing parts of the species’ DNA. The more similar the DNA sequence, the more closely related the species are

17. 4,2 When fossils indicate a slow change in evolution, this is called? gradualism

18. 4,3 When scientist compare organisms at their early stages of development, this is an example of what? Embryonic evidence

19. 4,4 When members of a species compete to survive. Competition

20. 5,1 Some variations make individuals better adapted, those individuals are more likely to survive and reproduce. Selection

21. 5,2 True or False? The final step of the natural selection model indicates that after many generations, the advantageous version of the trait is the only one present. False. The population still varies however most individuals have the advantageous trait.

22. 5,3 Looking at how these horses have changed over time is an example of which type of evolutionary evidence? Fossils

23. 5,4 What are the 5 steps in the natural selection model? 1. The initial population varies in many traits. Most individuals have one version of some traits. 2. An environmental change occurs. 3. Individuals with one version of a trait are more likely to survive after the environmental change. The trait is advantageous in the new environment. 4. The individuals that survive more reproduce more. Their offspring vary but are similar to them. So more offspring have the advantageous version of the trait. 5. After many generations, the population still varies, but most individuals have the advantageous version of the trait.