And that's exactly why mitosis begins to take place shortly following fertilization. So right about here, we have the first mitotic process take place and the unicellular zygote begins to undergo mitosis. It replicates the DNA and then cytokinesis takes place. And we form a structure that contains two identical cells that are equal size and which have the same exact genetic information. Now, by definition, a zygote only consists of one cell. And as soon as we form these two cells, this is no longer a zygote, but now we refer to it as the developing embryo.