Name ___________________________
Evolution Unit B 1.3
1. When did Darwin publish his book on evolution? _____________________________
2. Darwin’s work is still considered the Theory of Evolution? A scientific theory is a statement based on
_____________________and ____________________. pg. ___________
3. What happens if continued observation and experiment support a theory’s statement?
_____________________________________________________________________________
4. A theory that has been widely accepted is used to ________________ and____________ natural
_______________________________.
5. Using the chart on pg 29, what three areas do scientists use as evidence for evolution?
__________________evidence, __________________evidence, and _____________________ evidence.
6. Darwin gathered many specimens of __________________that caused him to think that species appear to have a
__________________ ancestor.
7. What is a common ancestor? _____________________________________________________________________
8. Which main idea in the theory of evolution does the idea of a common ancestor support?
_______________________________________________________________
9. True or False:. Scientists comparing modern plants and modern algae to fossil algae would say they all
share a common ancestor.
10. What kind of evidence do scientists returning to the Galapagos Islands today find to support Darwin’s ideas?
__________________________________________________________
11. These scientists study the _______________________ and the ______________________ of living things.
12. What conclusions do these scientists come to through their observations?_______________________________
_______________________________________________________________________________pg______
13. Evidence for evolution can also be observed within the ___________________ structures of adult
organisms such as _______________________ organs and _____________________structures with
different functions. pg___________
14. __________________________ organsr are physical structures that were fully developed and
________________________ in an _____________ ___________ of organisms but are reduced and
_________________ in _____________ species. pg.______
15. Give an example of a vestigial organ. ___________________________________________________________
_____________________________________________________________________________________________
16. Researchers use vestigial organs to show that modern organisms having these organs are __________________ to a
__________________ ancestor.
( NOT IN BOOK)-Similar structures with different functions are called HOMOLOGOUS STRUCTURES.
17. Scientists have compared the anatomy of living things and noticed that many different species share ___________________.
________________.
Look at pg 31. Describe how some scientists compare similar structures.
a lizard’s ________________, a bat’s _______________ and a manatee’s ____________
18. Do they have a similar function? _____________
19. However, even though these structures are used differently, some scientists believe this similarity in structure indicates that
these organisms shared a _______________ _______________.
20. What process caused the variations in form and functions of these homologous structures?
____________________________________________.
21. What factors influence natural selection? different _______________________,; different____________________.
.
22. Scientists also observed similarities in the early development of different organisms as an __________________ and the
study is embryology.
23. See page 32. What organisms are being compared? ____________________, ______________, and a
_______________________.
24. As the organism continues to develop, what happens to the similarities?
__________________________________________________________________________________________________
25. The key to understanding how traits are passed from one generation to the next lies in the study of______________, which is
the ______________ ______________ found in all cells.
26. What else does DNA contain? _____________________________________________________________________
_________________________________________________________________________________________________
27.What is the code in DNA made of? __________________________________________________________________
28.What letters represent the bases in DNA? __________________________________________
29. What is a gene? __________________________________________________________________________________
and each gene has a particular __________________ of bases. pg.____________
30. What is a clock gene and its function? _______________________________________________________________
_________________________________________________________________________________________________
31. What do evolutionary scientists believe concerning the similarities in the sequences between two organisms?
________________________________________________________________________________________
32. Even though the two organisms appear so different, much of the _________________ of their ____________is similar.
On a separate sheet of paper draw a graphic organizer showing Evidences of Evolution. Use the words biological, genetic,
homologous structures, vestigial structures, embryology, and fossils,