Name: Period: Evidence of Evolution Background



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For each animal, indicate what type of movement each limb is responsible for.


Animal

Primary Functions

Human

Using tools, picking up and holding objects

Whale




Cat




Bat




Bird




Crocodile





Compare the skeletal structure of each limb to the human arm. Relate the differences you see in form to the differences in function.


Animal

Comparison to Human Arm in Form

Comparison to Human Arm in Function

Whale

Whale has a much shorter and thicker humerus, radius, and ulna. Much longer metacarpals. Thumb has been shortened to a stub.

The whale fin needs to be longer to help in movement through water. Thumbs are not necessary as the fins are not used for grasping.

bird







crocodile









  1. Are the structures above examples of homologous, analogous or vestigial structures?



  1. Does this suggest an evolutionary relationship?


4) Comparative Anatomy continued

Compare the anatomy of the butterfly and bird wing below.

1. What is the function of each of these structures?



  1. How are they different in form (appearance)? Give (2) specific differences.


  1. Are these structures examples of homologous, analogous or vestigial structures?



Compare the overall body structure of the cave fish and the minnow below.



  1. What is the biggest, most obvious difference between the body structure of these two fish? (HINT: look

at the head!

2. Assume the two fish came from the same original ancestor. Why might the cave fish have evolved without eyesight?





  1. Are these organisms examples of homologous, analogous or vestigial structures?



  1. Does this suggest an evolutionary relationship?


5) Vestigial Structures in Humans
Below are some vestigial structures found in humans. For each, hypothesize what its function may have been.


Structure

Possible function?

Wisdom teeth




Appendix




Muscles for moving the ear




Body hair




Little toe




Tailbone



1. How are vestigial structures an example of evidence of evolution?




Written by James Dauray http://www.docstoc.com/profile/jamesdauray Page

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