So this is where nondisjunction took place in meiosis one, in anaphase one of meiosis. Now, let's suppose we have metaphase two take place, and metaphase two takes place normally. So all these chromosome pairs line up at the equator as shown, and these fibers form correctly. And we have the separation of these chromosomes to that side and these chromosomes to the other side. And so in this particular case, we formed these two identical sperm cells. And in this particular case, we formed these two sperm cells that don't have those sex chromosomes.