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Homologous & Analogous Structures (page 26)

Homologous & Analogous Structures (page 26). 12.16 and 12.17. Anatomy is the study of the structure, or parts, of an organism. http:// www.infovisual.info /02/069_en.html. http:// laughingsquid.com / lego - minifigure -anatomy-sculpture-by- jason - freeny /.

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Homologous & Analogous Structures (page 26)

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  1. Homologous & Analogous Structures(page 26) 12.16 and 12.17

  2. Anatomy is the study of the structure, or parts, of an organism. http://www.infovisual.info/02/069_en.html http://laughingsquid.com/lego-minifigure-anatomy-sculpture-by-jason-freeny/

  3. Comparative anatomy provides evidence of evolution because it shows that various organisms share a common ancestor. http://cyemae.wordpress.com/evolution-of-man/

  4. Homologous structuresare formed in similar ways during embryonic development and share like arrangements, however they can have different forms and functions. http://bio1151.nicerweb.com/Locked/src/chap22_q.html

  5. Examples of homologous structures: a whale’s flipper, a cat’s leg, a bat’s wing, a human’s arm.

  6. Analogous structuresare structures that have similar functions among unrelated animals, but do not come from the same embryological tissues. http://www.bio.miami.edu/dana/106/106F05_4.html

  7. Examples of analogous structures: an insect’s wing, a bird’s wing, a bat’s wing

  8. Decide if the following examples are homologous or analogous…

  9. Example A HOMOLOGOUS or ANALOGOUS

  10. Example B HOMOLOGOUS or ANALOGOUS

  11. Evolved from the same ancestor but now have different functions. Example C HOMOLOGOUS or ANALOGOUS

  12. Evolved from different ancestors, but because they were placed in the same environment, they have the same function. Example D HOMOLOGOUS or ANALOGOUS

  13. A poisonous spider and a poisonous snake both have venom sacs. Example E HOMOLOGOUS or ANALOGOUS

  14. A whale and a fish both have fins to swim underwater, however a whale is a mammal and a fish isn’t. Example F HOMOLOGOUS or ANALOGOUS

  15. A house cat and a lion evolved from the same ancestor, but no longer look alike (the house cat is much smaller than the lion). Example G HOMOLOGOUS or ANALOGOUS

  16. Draw this chart in your notebook…

  17. How are the limbs of the frog, whale, horse, lion, human, bat, and bird the same? • How are the limbs of the seven animals different? • Are these limbs examples of homologous or analogous structures? • Explain your answer to number 3. • What is the difference between a homologous structure and an analogous structure? Conclusions: Answer the following questions in complete sentences:

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