A trihybrid Punnett square is a diagram used to predict the possible genotypes and phenotypes of offspring from parents with three different heterozygous genes. It is an extension of the dihybrid Punnett square, which is used to predict the offspring of parents with two different heterozygous genes. To set up a trihybrid Punnett square, you first need to determine the genotypes of the parents. Each parent will have two alleles for each of the three genes, resulting in a total of six alleles. The alleles are then arranged in a 4×4 grid, with the alleles from one parent listed along the top and the alleles from the other parent listed along the side.
Once the alleles are arranged in the grid, you can begin to fill in the squares. Each square will represent a possible genotype for the offspring. To determine the genotype, you simply multiply the alleles from the top and side of the square. For example, the square in the upper left corner will represent the offspring with the genotype AaBbCc. The square in the upper right corner will represent the offspring with the genotype AaBBCc, and so on.
