So in human somatic cells, we know that if we begin with 46 chromosomes, we have to produce cells that also consists of 46 chromosomes and any variations to this number. For example, if we produce 45 chromosomes or 47 chromosomes, this leads to a condition known as anapply. Now, let's discuss how none disjunction actually takes place in mitosis as well as in meiosis. So let's begin with mitosis. Now, mitosis actually consists of four individual phases. We have ProPhase, metaphase, anaphase, and telephase.