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Reproductive isolation can occur through mechanisms that prevent fertilization from occurring.
- Howard Hughes Medical Institute
- Classroom activity
Time: Two 45-minute blocks
This lesson explains how genetic switches function and their role in the process of evolution through the use of clips from the HHMI DVD, Evolution: Constant Change and Common Threads, and the construction of a model. This activity can be done as a demonstration, a student inquiry activity, or a combination of the two.