Chapter 5: Cell Division

Table of Contents:


The cell theory states that all living creatures are made of cells, which are the basic structural units of all organisms. This theory also states that cells originate from preexisting cells, through the process of cell division.

To help us see the importance of cell division, let’s consider the example of a fully grown person. The cell theory tells us that each of this person’s cells originated from a preexisting cell; so, each cell should have the same common ancestor.

The common ancestor of all human cells is called the zygote. Through the process of exponential cell division, a zygote makes two cells, then four, then eight, then sixteen, etc.

There are three main types of cell division you could run into on the DAT: