Great Transformations WK PDF

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Mandatory class assignment ...

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Na me : Pe r i o d: Da t e :

Video: Great Transformations This video is the second episode of the PBS Evolution series. It deals with some of the biggest evolutionary steps in the history of life on earth. Please answer the following questions on your own, using your own knowledge and information from the video (1 pt. each): 1. For how long has the tree of life been branching?

2. When the history of the earth is represented by an hour, how long has man been around?

3. What are the largest living animals?

4. When did mammals first appear?

5. What did Frank Fish find that was similar between the way whales, otters, and dogs move?

6. Why are all land animals tetrapods (four-legged animals)?

7. When did animals first move onto land?

8. Early theories said fish moved onto land then developed limbs. What is the current idea about when limbs developed?

9. What transformation happened half a billion years ago during the Cambrian Explosion?

10.

What is important about Pikaia, found in the Burgess Shale?

11. Levine and McGinnis studied the Antennapedia gene in fruit flies. What happens when that gene doesn’t work correctly?

12. What happened when Walter Gehring replaced a fly’s eye gene with one from a mouse?

13.

What was the crucial turning point in the development of man?...