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Transcript
Intel® Teach Program Designing Effective Projects Mini-Lesson: Punnett Squares Each parent of an organism contributes a gene with two alleles that may be dominant or recessive. A dominant trait will always be expressed over a recessive trait. This can be illustrated with a simple chart called a Punnett Square: Pea Plant Examples Plant 1 = Dominant Tall (TT) = Tall Plant Plant 2 = Mixed Hybrid (Tt) = Tall Plant T T T TT TT t Tt Tt Each square represents a potential offspring. Discuss the results and ask students to explain why each offspring in this example will be tall. Ask students to hypothesize how a short plant could be produced. Can two tall plants produce a short plant? Complete the next example: Plant 1 = Mixed Hybrid (Tt) = Tall Plant Plant 2 = Mixed Hybrid (Tt) = Tall Plant T t T t What percentage of the offspring would you predict to be tall plants? What percentage will be short plants? What are the benefits of being able to predict genetic outcomes? Complete additional examples as needed for student practice. Copyright © 2011 Intel Corporation. All rights reserved. Intel, the Intel logo, the Intel Education Initiative, and the Intel Teach Program are trademarks of Intel Corporation or its subsidiaries in the U.S. and other countries. *Other names and brands may be claimed as the property of others. Page 1 of 1