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Purpose:
To introduce the concepts of variation, natural selection, and selective pressures.
Summary:
Students observe and record three variations that exist in humans, examine figures and diagrams of the horse's fossil record that show evolutionary changes, and see how positive and negative selective pressures can affect a "stock population" of organisms (colored paper squares and moths). Data used to create graphs of distribution curves of students' earlobe lengths, index finger lengths, height, as well as moth color and square size.
Objectives Links:
The Who, What, and Why of Evolution
Process Skills Checklist
Materials:
Per student:
- 1 tape measure
- 3 sheets of graph paper
- 1 set of paper moths and squares
Safety Concerns:
No special safety measures needed.
Revision Date:
Summer 2001
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