the zygote is a single celled and human adult has about 100 trillion cells.
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As zygote undergoes cell division , or mitosis to develop an adult consists of trillion of cells. Firstly it undergoes mitosis 1st which is first reduction division and due to this process 100 trillion cells will be divided into 50 trillions {halved}. After it again 2nd mitotic phase starts as well as meiosis and the chromosomal number will be 25 to 50 trillion and so on..... The cell would have to repeat this process 40 times (one cell going under mitosis 40 times is equivalent to 1 times 2 to the 40th power, which equals 1 trillion).
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