And this basically causes a variation of the correct number of chromosomes. And both of these cells have the condition known as anapply. So nondisjunction can occur in somatic cells during the process of mitosis. At the beginning of anaphase, the spindle fibers begin to pull on the cystochromatids in an attempt to separate those chromatids equally to opposite poles of the cell. Now, none disjunction takes place when the centromere holding our two chromatids fails to break or the spinal fiber actually fails to attach to one end of the chromosome. And both chromatids in that chromosome are pulled to the same side of the cell.