1. Stages of Mitosis IPMAT
Interphase-Prophase-Metaphase-Anaphase-Telophase
“I Passed My Algebra Test”
“I Play Music All the Time!”
Stages of Mitosis
IPMAT
Make sure to include anything with a star on your notes!

2. Interphase Events How to Recognize Purpose:
G1: Cell grows and recovers from previous division (4 hours)
S: DNA is synthesized, making 2 copies of each chromosome (this forms sister chromatids – 10 hrs)
G2: Cell builds more organelles and prepares for next division (4 hours)
Nuclear membrane still visible
Chromatin loose but not visible since it is unwound for easy access to DNA
Centrioles next to each other
Nucleolus visible
Purpose:
Conduct normal cell activities
Copy DNA and prepare for mitosis

3. Interphase in Animal Cell
Nuclear Membrane
Nucleolus
Chromatin

4. Interphase in Plant Cell
Nuclear Membrane
Chromatin
Nucleolus

5. Prophase Events How to Recognize Purpose:
Chromatin condenses into chromosomes
Nuclear membrane dissolves
Centrioles migrate to opposite poles of cell
Nucleolus dissolves
Chromosomes visible, but randomly scattered throughout nucleus
Centrioles partly separated
Nucleolus and nuclear membrane have disappeared
Untangles chromatin to form chromosomes that can be easily moved
Purpose:

6. Prophase in Animal Cell
Chromosomes
Nuclear Membrane
Centriole

7. Prophase in Plant Cell
Nuclear Membrane
Chromosomes

8. Metaphase Events How to Recognize Purpose:
Sister chromatids line up at equator of cell
Centrioles reach the poles
Spindle fibers form spindle apparatus, connecting centromeres to centrioles
Nuclear membrane completely dissolved
Single row of chromatids across center of cell
Spindle fibers stretch across cell from chromatids to centrioles
No sign of nucleus
Organizes chromosomes & prepares them for separation
Purpose:

9. Metaphase in Animal Cell
Spindle Fibers (Individual Strands)
Spindle Apparatus
(All Fibers Together)
Centriole in center of spindle fibers
Sister Chromatids
Poles (Opposite ends of cell)

10. Metaphase in Plant Cell
Sister Chromatids
Equator (Line across center of cell)

11. Anaphase Events How to Recognize Purpose:
Centromeres split & sister chromatids separate
Spindle fibers pull chromatids towards opposite poles of cell
Sister chromatids halfway between equator and poles
Gap between two rows of chromatids
Chromatids have not reached the poles yet
Sends one copy of each chromosome to opposite sides of the cell
Purpose:

12. Anaphase in Animal Cell
Aster
(Star-shaped group of spindle fibers around a centriole)
Sister Chromatids

13. Anaphase in Plant Cell
Sister Chromatids

14. Telophase Events How to Recognize Purpose:
Chromatids reach the poles
Spindle apparatus dissolves
Cell pinches in half and forms new membrane (“cytokinesis”)
Plant cell has cell plate forming a new cell wall on equator
New nuclear membrane forms
Chromatids unwind to become chromatin again
Chromatids in clusters at opposite poles
Cell folding inwards to split in half (or cell plate appears)
Nuclear membrane becomes visible while chromatids disappear
Purpose:
Completes cell division by splitting the parent cell into two daughter cells

15. Telophase in Animal Cell
Sister Chromatids
New Cell Membrane Forming

16. Telophase in Plant Cell
Sister Chromatids
Cell Plate forming a new Cell Wall

17. Assignment!
Draw diagrams of each stage of mitosis in an animal cell. You can use the text or internet to find diagrams. (The worksheet shows mitosis in a plant cell, but you need to draw an animal cell.)
Use these notes and this powerpoint to name the stage for each event listed on the back of the notes.

18. References “The Biology Project: Cell Cycle & Mitosis” Website
“Mitosis Stages” website: