1. (7th) Chapter 7-2 Cornell Notes
Evidence of Evolution

2. Chapter 7-2: Key Questions
What evidence supports the theory of evolution?
How do fossils form?

3. Chapter 7-2: Key Terms comparative anatomy- homologous structures-
mold-
cast-
petrified fossil-
trace fossil-
paleontologist-
gradualism-
punctuated equilibria-

4. Chapter 7-2 Paragraph 1 Evidence of organism change:
1. similar body structures;
2. patterns of early development;
3. molecular structure (DNA sequences);
4. fossils.

5. Chapter 7-2 Paragraph 2 1. Similar Body Structures:
comparative anatomy: comparison of different parts of organisms ;
like an internal skeleton with a backbone;
vertebrates: fish, birds, amphibians, mammals, reptiles;
homologous structures: similar structures that related species have gotten from a common ancestor.

6. Chapter 7-2 Paragraph 3 2. Patterns of Early Development:
tail, rows of tiny slits in throat before birth;
similar DNA and proteins suggests common ancestor.

7. Chapter 7-2 Paragraph 4 3. Molecular Structure: DNA sequences;
similar DNA and proteins.

8. Chapter 7-2 Paragraph 5 4. Fossils:
most fossils form when buried in sediment;
Example 1 “molds”: hollow area in sediment in the organism’s shape;
Example 2 “casts”: solid copy of the organism’s shape, opposite of mold;
Example 3 “petrified fossils”: minerals replace part or all of an organism;
Example 4 “trace fossils”: evidence of their existence;
Example 5 “preserved remains”: preserved in tar,amber or ice.

9. Chapter 7-2 Paragraph 6 4. Fossils:
paleontologist: scientist who studies fossils;
explores history of life and past environments;
also rate/speed at which evolution occurs.
Chapter 7-2 Paragraph 6

10. Chapter 7-2 Paragraph 7 How rapidly do species change?:
gradualism: evolution slow but steady;
punctuated equilibria: evolution quick during relatively short periods, can explain “gaps” in fossil record.