So if this Xcel combines with this sex cell, they form a Zygo that will be uppercase T, lowercase T. So we have uppercase T, and we have lowercase T. Now, what about if this crosses with this? So, once again we have the same exact situation. We have an uppercase T combines with the lowercase T, and this will be the genotype of our Zygote. Or we can have this and this. So in this case, it's T mixing with T. So now we have lowercase T lowercase T, and lowercase T lowercase T. So these are the potential genotypes, the possibilities of the genotype for the offspring. If the genotype of this plan is uppercase T, lowercase T. So each one of these squares, and we have four squares.