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Name: Date: Per: Chapter 7.3 Reading and Notetaking Guide Evolution of Species (p. 241-246) A Variety of Species (p. 242) 1. How have different environment produced different species? ____________________________________________________________________________________ ____________________________________________________________________________________ 2. What is a habitat? ____________________________________________________________ 3. List two ways that variations may occur. a. ___________________________________________________________________________ b. ___________________________________________________________________________ 4. Species with a lot of _______________ in their gene pools can often adapt to changes in the environment because some individuals will have traits that let them survive in new condtions. How Do New Species Form? (p. 243) 5. Is the following sentence true or false? When a group of individuals remains isolated from the rest of its species long enough to evolve different traits, a new species can form. _______________ 6. What are three ways that isolation can occur? ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 7. Why can isolation cause differences in species and possible lead to a new species? ____________________________________________________________________________________ ____________________________________________________________________________________ Inferring Species Relationships (p. 244-245) 8. Is the following sentence true or false? The more closely related species are, the more similar their DNA sequences. _______________ 9. What have scientists learned about the elephant shrew based on DNA evidence? ____________________________________________________________________________________ ____________________________________________________________________________________ ________________________________________________________________________ 10. Circle the letter of each sentence that is true about evolutionary relationships of organisms. a. scientists infer that species with similar body structures and development patterns inherited many of the same genes from a common ancestor b. scientists can compare protein structure to determine how closely two species are related c. a branching tree shows how scientists think different groups of organisms are related. d. DNA evidence shows that giant pandas are more closely related to raccoons than to bears. Extinction of Species (p. 245-246) 11. If no members of a species are still alive the species is _______________. 12. Why can changes in a species’ environment cause extinction? ____________________________________________________________________________________ ____________________________________________________________________________________ 13. Name two ways in which an environment can change. a. _____________________________________________ b. _____________________________________________ 14. Explain how a change in climate can lead to extinction. ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 15. Is the following sentence true or false? Environmental changes always lead to extinction because organisms don’t have traits to help them survive the changes. _______________
