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Some of your students may have been introduced to the concept of Punnett squares in middle school life science, but many students do not remember how to develop a Punnett square to accurately predict the probability of a genetic cross.
It is important to remind your student that Punnett squares DO NOT TELL THE FUTURE! Punnett squares are a tool to organize the geneotypes of the parents for a given trait, create the cross, and count up the possible genotypes/phenotypes that can result for the given cross. The punnett square will not tell exactly what will occur, but will allow students to trace the genotypes of the parents, create potential genotypes of the offspring, and calculate the probability of the offspring occurring in the population.
Punnett squares are a simple tool for students to create that will organize their data and provide a visual representation of the distribution of certain traits. Although Punnett squares are useful tools to predict outcomes, many students view them as riddles as they work to calculate the probably outcomes.
As a simple introduction, or possible review, students will record Probability Punnett Squares Lecture Notes that describe how to create a Punnett square and the rationale of using Punnett squares to predict probable genetic outcomes. The lecture notes contain five review questions to reinforce the main idea of creating and solving Punnett square practice problems.