Download Evolution Tutorial

Evolution Tutorial
Directions: Print this answer sheet. Using the website indicated. Read and
answer the following instructions.
Click the INTRODUCTION tab.
1. Evolution refers to modifications, or _______________, which eventually
result in the formation of ___________ ____________.
2. What does evolved mean? ____________________________________
3. What does extinct mean? _____________________________________
4. How do we know that millions of organisms that lived in the past have
gone extinct? _____________________ _________________________
5. The American cougar and the African lion both share a common
_________________ from the past.
6. Are all cat species related? ________ Why? _______________________
7. Evolution works because is takes an existing structure and ____________
that structure.
Click the GENES tab.
8. New individuals born in a ______________________ can potentially
inherit any of the genes in the __________ __________ .
9. Gene frequency refers to how frequent a ___________ or ___________
is in a population.
10. Gene frequency can change because of __________. When the gene
____________ changes the population is ___________________.
11. Gene flow occurs when genes are able to move from
__________________________________________________________ .
12. If gene flow stops, isolated populations may change enough that they can
no longer ___________ ___________ __________ of the ____________
___________________ .
13. What is speciation? __________________________________________
14. If two populations are separated for a VERY long time, and then the two
populations are later brought together, they MAY have changed so much
that they can no longer ________________.
15. Why do you think the arctic fox has thick fur?
___________________________________________________________
16. Why do you think the Gray Fox developed thin fur?
___________________________________________________________
Click the NATURAL SELECTION tab.
17. Natural selection works because nature selects ____________ that are
the best for a given _______________.
18. What does traits mean? __________________ .
19. Artificial selection is not caused by nature, it is cause by ___________ .
20. What is the first principle of Natural Selection _____________________ ?
21. Why do organisms produce more offspring than needed?
__________________________________________________________
22. What is the second principle of Natural Selection __________________?
23. Why is variation important?
__________________________________________________________
24. What is the third principle of Natural Selection _____________________ .
25. Why is there competition within a species?
__________________________________________________________
26. What is the fourth principle of Natural Selection _____________________
27. What does fitness not mean? __________________________________
28. Why does fitness mean? _______________________________________
Click the MUTATION tab.
29. What is a mutation ? _________________________________________
30. Are mutations usually beneficial? ________
31. Mutations are the source of _______ _________ in a ______________ .
32. _______________ ______________ will weed out _____________
mutations and select for __________________ mutations.
33. Why does the red bug eventually thrive? ______________________
34. In this example: The ______________ of the red allele is ___________.
A change in _____________ ____________ is _______________.
35. The _____________ for white fur made it possible for the _____________
of the polar bear.
36. What causes sickle cell anemia? ________________________________
37. What does it do to the red blood cell? ____________________________
38. Why is the relationship of sickle cell allele and malaria?
___________________________________________________________
39. Since malaria is wide-spread in Africa, is there a natural selection process
occurring in relationship to the sickle cell allele? Explain.
___________________________________________________________
___________________________________________________________
___________________________________________________________
Click the ADAPTATIONS tab.
40. Natural selection will favor ______________ that will be __________.
41. According to the text, mammals evolved from _________________. The
teeth of mammals are more ________________ than the teeth of reptiles.
Click the PHYLOGENY tab
42. What is phylogeny? _______________________________________ .
43. How are these relationships expressed? _______________________ .
44. All Arthropods have ________ _________ ________ joints and a
_________________ body.
45. Which class of animals is the most successful? ____________________
46. How is the reptile brain and the mammal brain different?
___________________________________________________________
47. What is the significance of Cynognathus?
___________________________________________________________
48. How many species of mammals are there? ________________________
49. The wings of the bird are _______________ to the front legs of a reptile.
50. The body of a reptile is covered with scales. A bird has scales only on the
_____________. Both animals have ____________. Reptiles have claws
on all four legs while birds only have claws on their _________ ______.
51. What is the significance of Archeopteryx?
__________________________________________________________
52. How many species birds are there? _____________________________
53. Can they all fly? ______ Name one: _____________________________
Click Quiz Questions
Answer QUIZ QUESTIONS 1-12 in full sentences on a separate sheet of
paper.