Within this homologous pair we have an uppercase g and a lowercase g. Within this homologous pair we have uppercase T and we have a lowercase t. Now when myosis actually takes place and at the end we form different types of gametes, there are only four possibilities for the gametes. What are these possibilities? Well, basically the upper case g can combine with the uppercase T to form gamete number one, or uppercase g can combine with lowercase T to form gamete number two. Or we can have lowercase g combined with uppercase T to form gamete number three. And finally lowercase g combined with lowercase T to form gamete number four. So we see that if we take two of these different f one generation offspring and we cross them together, there are four possibilities for the gametes.