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Warmup

Warmup. Describe the variation pictured above. Speculate as to how natural selection in different environments has produced such large differences. Warmup.

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Warmup

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  1. Warmup Describe the variation pictured above. Speculate as to how natural selection in different environments has produced such large differences.

  2. Warmup Brainstorm a situation where the ideas of variation, natural selection, and adaptation apply to non-living things. Share your answer with a partner and be prepared to explain to the class.

  3. Homologous Structures NOVEMBER 19, 2010

  4. Homologous Structures Homologous structures are structures which are similar even in widely differing species. It is evidence of divergence from a common ancestor. The form is similar even though the function may not be. Tool user Runner Pouncer Flyers Swimmer itc.gsw.edu/.../histgeol/paleo2/homol1.htm

  5. Homologous Structures The ancestor started with four primitive but functional wings. How have the form and function diverged in contemporary insects? http://www.press.uchicago.edu/books/gee/carroll4.html

  6. Homologous Structures http://evolution.berkeley.edu/evosite/lines/images/homology.gif • The pitcher plant and venus fly trap live in environments with poor soil and need extra nutrients. • The poinsetta has to attract insects in order to promote pollination. • The cactus has to protect its moisture from pests. • Describe a possible variation as a first evolutionary step from a regularly shaped leaf toward each of these specialized homologous structures.

  7. Homologous Structures http://8e.devbio.com/article.php?ch=18&id=178 Describe the form and function of the pictured structures (antennae and leg). Compare them, and use the vocabulary word homologous in your sentence.

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