Because we knew nothing about meiosis. So now let's actually try to combine the concept of meiosis with the principle of segregation. So basically, nowadays we know that segregation is a direct result of the separation of the homologous chromosomes. That contain the two genes, those two hereditary factors which takes place during the process of meiosis. So let's basically tweak this slightly to see how it actually takes place. So let's suppose we have parent number one.