Lesson Summary: Big Beans, Little Beans

Lesson summary for... Big Beans, Little Beans Author/Source: UC Museum of Paleontology

Overview:	Students measure and note the variation in the lengths of lima beans. Students then compare the growth rate of different sized beans.
Concepts:	This lesson covers the following concepts: Evolution results from natural selection acting upon variation within a population Individual organisms with advantageous traits are more likely to survive and have offspring. Scientists pose, test, and revise hypotheses based on research outcomes. Science explains the natural world using evidence from the natural world.
Grade Level:	6-8
Time:	variable
Teacher Background:	Explore these links for additional information on the topics covered in this lesson: Adaptation Natural Selection
Teaching Tips:	Prior to this activity, students should know that seeds germinate to produce the next generation of the plant and that the cotyledon provides both protection and food for the growing plant embryo. Class discussion will help students understand that there may be an advantage to individual variation within populations and that scientists perform experiments to test their ideas.