Define dihybrid. Use example of pea plants seed shape and color. Specify the dominant trait and indicate the letter shorthand for dominant and recessive. Record that yellow is dominant and round is recessive. Discuss the two possibilities for dihybrid, a dependent assortment or an independent assortment. Work a punnet square for dependent assortment, specify the phenotype and genotype ratios as 3:1 and 1:2:1 ratio. Define and discuss an independent assortment of alleles. Note the gametes formed and the possibilities of fertilization matches. Determine that a 16 square punnet is required and indicate all the possible gamete alleles and crosses. Determine the ratios and state their dominance/recessive ratio