Most people are familiar with Mendel's test crosses as monohybrid, dihybrid, or even trihybrid. But have you ever wondered what it would look like if Mendel had done a heterozygous test cross for ALL seven of the traits he studied with his original pea plant studies? This document represents a seven trait heterozygous Punnett Square Test Cross even Mendel himself would be in awe of! The AaBbCcDdEeFfGg x AaBbCcDdEeFfGg cross results in a 129 x 129 Punnett Square that's 16,641 different possibilities! Great activity to tape together and laminate yourself for a class discussion, or better yet - divide the papers between the students in class and have them assemble the Punnett Square based on the given genotypes for maternal and paternal gametes.