1. The Stages of Mitosis
Ch. 8

2. Mitosis is… The division of the nucleus! Mitosis only deals with the
Cell division is the rest of
the cell
cytokinesis = cytoplasm

4. Prophase The 1st phase of mitosis Coiling of DNA into chromosomes
The 2 copies of each chromosome – the chromatids- stay connected to one another by the centromere.
Centrioles

5. Centrioles in Prophase
2 pairs centrosomes appear near the nucleus
Each centrosome contains a pair of small, cylinders (pasta looking) things called centrioles
The centrosomes of
plant cells lack centrioles.
In both animal and plant
cells the centrosomes move
toward opposite poles of the cell

6. Prophase Continued
As centrosomes separate, spindle fibers made of microtubules radiate from the centrosomes
The array of spindle fibers is called the mitotic spindle which will equally divide the chromatids between the two daughter cells

8. Metaphase 2nd phase of mitosis
Chromosomes are easy to identify in microscope because they are lined up and dense
Microtubules line chromosomes at center of the cell

10. Anaphase 3rd phase of mitosis
The chromatids of each chromosome separate at the centromere
They move, centromere first, toward opposite poles of the dividing cell.
After the chormatids separate, they are considered to be individual chromosomes

12. Telophase 4th phase of mitosis
Once chromosomes reach opposite ends of the cell, the spindle fibers disassemble (break apart)
The chromosomes return to their loose state and the nuclear envelope forms around each set of chromosomes