And each pair of chromosomes is called a homologous pair. And we'll see what that means in just a moment. So in any homologous pair, one chromosome came from the female gamete, and the other chromosome came from the male gamete. So if we look at the following diagram, let's suppose we have a male gamete, the sperm cell. We have one chromosome, we have a female gamete. Let's say that's the egg, and they combine.