So let's move on to nondisjunction taking place in meiosis. Now, because meiosis actually consist of meiosis one and meiosis two, that means there are two different places, two different times where nondisjunction can actually take place. So let's begin by assuming that nondisjunction only takes place during meiosis one. So, once again, we're dealing with only well, if we take a look at our normal human carotype, technically speaking, we should be showing all these individual chromosomes within the cell. But to save time, I'm only going to focus on the 23rd chromosome pair, our sex chromosome pair. So we're not going to consider the autosomal chromosomes in this particular case.