Final answer:
Phenotype is a way to describe visible traits, while genotype refers to the underlying genetic makeup. The genotype determines the phenotype, just like a recipe determines the outcome of a cake. Mendel's pea plants demonstrated the relationship between genotype and phenotype.
Step-by-step explanation:
Phenotype is a way to describe the traits you can see. The genotype is like a recipe for a cake, while the phenotype is like the cake made from the recipe. The genotype expresses the phenotype. For example, the phenotypes of Mendel's pea plants were either tall or short, which was determined by their genotype.