In this activity, students take Punnett Squares to the next level by analyzing a cross with three heterozygous traits. This is no small task, and students gain an appreciation for the real complexity of genetics and inheritance and the incredible leap of understanding completed by Gregor Mendel. At the same time, they get a lesson being patient and paying close attention to how you organize data - key aspects of scientific study. This is excellent as an extra credit assignment or as a single day activity with a higher-performing class, and the involvement of different organizing aids helps with differentiation. If students can do this problem, you know they can do any other genetics problem they are likely to encounter!
-Student Prompt (if an extra credit assignment)
-Blank Trihybrid Punnett Square
-Graphic Organizer for determining allele combinations
-Analysis Questions (if an in-class assignment)
Trihybrid Cross Lesson
by Mark Blessington
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