The document describes the stages of mitosis: prophase where chromosomes become visible and the nuclear envelope breaks down, metaphase where chromosomes line up on the equator, anaphase where chromatids are pulled to opposite poles by contracting spindle fibers, and telophase where two new nuclei form and cytokinesis separates the parent cell into two daughter cells that enter interphase.

1. Emily and Elspeth

2. utu
At the beginning of mitosis,
the DNA has been
replicated and exists in the
nucleus as invisible
chromatin

3. utu
Chromosomes become
visible
Prophase

4. utu
Nuclear envelope and
nucleolus disintegrate
Centrioles move to
opposite poles of the cell

5. utu
Metaphase
Spindle fibres extend
centrioles which attach to
the chromosomes

6. utu
Chromosomes are pulled
into line on the equator by
spindle fibres from the
opposite side

7. utu
Anaphase
Spindle fibres contract

8. utu
Chromatids are pulled to
opposite poles

9. utu
Telophase
Chromatids reach poles

10. utu
Nuclear envelope and
nucleolus reform around
the two new, identical
nuclei

11. utu
Chromatids become
chromatin, so are invisible
again
Spindles disintegrate

12. utu
Cytoplasm of parent cell divides,
leaving 2 genetically identical
daughter cells

13. utu
Cells re enter interphase