Phases of Mitosis
There are seven phases of mitosis: interphase, prophase, metaphase, anaphase, telophase, G1 interphase and G2 interphase. During interphase, the nuclear membrane is intact, and the chromosomes are uncoiled. When mitosis proceeds to prophase, the spindle fibers form as the nuclear membrane disintegrates, which sets the cell up for division; the chromosomes are now coiled.
With metaphase, the chromosomes are aligned, resulting in a separation of chromatids in the anaphase. In each chromosome, there are two chromatids; when they separate, it allows for an equal number in each new cell. The eight chromosomes that were in the parent cell are now 16 chromatids.
In telophase, the parent cell divides into two daughter cells. In each daughter cell, there are eight chromatids. Since division is over, the spinal apparatus is dissembled and the nuclear membrane reforms. During the G1 and G2 interphase, the daughter cells adjust, allowing them to develop fully.
This is seen in the number of chromatids: during the G1 interphase, each chromosome has one chromatid; during the G2 interphase, each chromosome now has two chromatids. After the G2 interphase, the cell can be divided again.