February 22, 2013

1. February 22, 2013 (A Day) Agenda • DSJ #27 • Evidence of Evolution (Notes) • Fossil Formation Diagram • DSR #27

2. February 25, 2013 (B Day) Agenda • DSJ #27 • Evidence of Evolution (Notes) • Fossil Formation Diagram • DSR #27

3. DSJ #27 • Science Notebook – 54B • Prompt: Think about the following animals – horse, rabbit, zebra, squirrel, donkey, deer, chipmunk, mouse. In 5 sentences or more, which animals would you group together based on their similarities? Explain.

4. Evidence of evolution

5. Learning Objective Students will state evidence that supports the theory of evolution and describe how fossils form.

6. Forms of Evidence – Body Structure • The structure of the bones in a dolphin’s flipper, a bird’s wing, and a dog’s leg is similar. Homologous bones are shown in the same color.

7. Forms of Evidence – Body Structure • 1.) Similar body structures that related species have inherited from a common ancestor are called homologous structures.

8. Forms of Evidence – Body Structure • An organism’s anatomy is its body structure.

9. Forms of Evidence – Body Structure • An organism’s anatomy is its body structure. • Fishes, amphibians, reptiles, birds, and mammals are classified together as vertebrates.

10. Forms of Evidence – Body Structure • An organism’s anatomy is its body structure. • Fishes, amphibians, reptiles, birds, and mammals are classified together as vertebrates. • 2.) This is because they all have a similar anatomy – an internal skeleton with a backbone.

11. Forms of Evidence – Early Development • Scientists make inferences about evolutionary relationships by comparing how different species develop before birth.

12. Forms of Evidence – Early Development • Scientists make inferences about evolutionary relationships by comparing how different species develop before birth. • 3.) During early development, all vertebrates have a tail and rows of tiny slits in their throats.

13. Forms of Evidence – Early Development • Scientists make inferences about evolutionary relationships by comparing how different species develop before birth. • 3.) During early development, all vertebrates have a tail and rows of tiny slits in their throats. • These similarities suggest that vertebrate species share a common ancestor.

14. Forms of Evidence – Early Development

15. Forms of Evidence - DNA • The structure of organisms’ DNA and protein molecules also provides evidence of evolution

16. Forms of Evidence - DNA • The structure of organisms’ DNA and protein molecules also provides evidence of evolution • 4.) If two have similar DNA and proteins, they probably evolved from the same ancestor.

17. How Do Fossils Form? • 5.) Most fossils form when organisms that die become buried in sediments. True

18. How Do Fossils Form? • 6.) The formation of any fossil is a rare event. False

19. How Do Fossils Form? • 7.) 1. Animal dies, sinks to bottom. 3. Over millions of years, the sediments harden. 4. The animal is preserved as a fossil. 2. Layers of sediment cover the body.

20. How Do Fossils Form? • 8.) • The most common fossils are molds and casts. • A mold is a hollow area in sediment in the shape of an organism. • A mold forms when the hard part of the organism is buried in sediment. • a. • b.

21. How Do Fossils Form? • 8.) Continued…. • A cast is a solid copy of the shape of an organism. • Molds and casts preserve details of the animals structure. • c. • d.

22. How Do Fossils Form? • Mold Fossils • Cast Fossil

23. How Do Fossils Form? • 9.) Fossils in which minerals replace all or part of an organism are called petrified fossils.

24. Glue in SNB **Please remember to use only TWO drops of glue!!** If everyone uses only TWO drops, a lot of glue is saved over time…. • 53A – Evidence of Evolution (Notes) • 54A – Fossil Formation Diagram

25. Fossil Formation Diagram • Textbook p. 236-237 • Copy the diagram “Fossil Formation” • Include all captions. • You may use a different animal but be sure to change the caption accordingly. • Color is extra credit.

26. DSR #27 • Science Notebook – 54B (Under DSJ #27) • Prompt: What are homologous structures? What are molds and casts? What is a petrified fossil?