Now, let's assume nondisjunction takes place. And let's say that nondisjunction takes place within this cell. So what happens is this centriole basically fails to extend the fiber, and that bonding between the fiber and this particular cystochromatid failed to actually take place. Now, let's suppose that non disjunction does not take place within this particular cell. So this cell correctly undergoes meiosis too. And so when these two identical cister chromosomes segregate to opposite poles and the two cells form, these will be the identical cystochromatids, the identical cells that will contain the identical correct X cells.