So now that we know what a punnant square is, let's actually take a look at how we can apply the punant square to help us solve different types of problems in genetics. And let's begin by discussing those same two experiments that were conducted by Gregor Mendel which allowed him to basically discover the law of dominance and the existence of dominant traits and recessive traits. So let's begin with experiment one. Now, in experiment number one, what he did was he took a true breeding tall plant and he mixed it, he crossed it with a true breeding short plant. And what that basically means is he took a homozygous dominant plant and he mixed it with a homozygous recessive plant. So the phenotype for this plant is tall and the genotype is uppercase T. Uppercase T, where upper case T represents that gene that codes for proteins that expresses the tall height.