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. Now, because nondisjunction took place within this second haploid cell, because this failed to form the proper connection. This entire pair of identical sister chromosomes basically moved to opposite side and none of those sex chromosomes move to the other side. And so eventually, when we form our two X cells from this particular cell, we form cell number one and cell number two.