The question is, what exactly is the genotype of this f one generation? Well, to determine what the genotype is, we have to determine what all the possibilities of that genotypes are. And to do that, we have to apply the punant square. Remember, the punant square is the tool that we use in genetics that allows us to determine all the different potential possibilities for the genotype of that particular offspring. So we begin with a parent that has uppercase T, uppercase T, and the other parent has lowercase, lowercase T. And they mix, they make their cross and they produce a certain offspring. So let's begin with the homozygous dominant, which means we have uppercase uppercase T. And when we produce the gametes, the two T separate into individual cells.