So in humans, we're going to have 23 pairs of these chromosomes line up at the middle. And then during anaphase, if these connections are formed correctly, these 23 pairs of chromosomes are basically moved to opposite poles. Now, if nondisjunction takes place, what that means is, once again, we fail to form this fiber attachment. And so instead of this attaching here and this attaching here, let's say what happens is this attaches here and also attaches there. And so now what happens is we have nondisjunction takes place and both of these pairs of chromosomes basically move to one side of the pole. And so when we have when we produce those two cells, one of the cells will lack the sex chromosome and the other one will have an extra pair of sex chromosomes.