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Resource library Teaching materials Evolution 101

Lesson summary for:
Toxin resistance in clams

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Overview:
This case study in the form of a set of PowerPoint slides examines the evolution of toxin resistance in clams.

Author/Source:
Evo-Ed

Grade level:
13-16

Time:
one to two class periods

Teaching tips:
This case study is also appropriate for zoology and ecology classes. The toxin resistance is quite interesting and should be engaging to a qualified student; however, background in cell membrane physiology should be a prerequisite.

Concepts:
Correspondence to the Next Generation Science Standards is indicated in parentheses after each relevant concept. See our conceptual framework for details.

  • There is a fit between organisms and their environments, though not always a perfect fit.

  • An organism's features reflect its evolutionary history.

  • Some traits of organisms are not adaptive.

  • There is a fit between the form of a trait and its function, though not always a perfect fit.

  • New heritable traits can result from mutations.

  • Mutation is a random process.

  • Organisms cannot intentionally produce adaptive mutations in response to environmental influences.

  • Complex structures may be produced incrementally by the accumulation of smaller advantageous mutations.

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