1. Identifying stages of the cell cycle
growth and preparation
interphase
mitosis
continued growth and preparation
cytokinesis
replication
Use the following vocabulary works in the box above to label the stages of the cell cycle in the following diagram: 1.
Growth and preparation 5.
Cytokinesis 2.
Replication 6.
Interphase 4.
Mitosis 3.
Continued growth and preparation 1

2. Briefly describe what is occurring in each stage of the cell cycle:1. 2. 3. 4. 5. 6.
Growth and preparation: Cells grow and carry out life functions.
Replication: The nucleus makes a copy of its DNA.
Continued growth and preparation: There is continued growth and preparation for mitosis.
Mitosis: The nucleus of the cell divides into 2 equal and identical parts.
Cytokinesis: The 2 equal, identical parts of the cell separate.
Interphase: Cells grow and carry out their life functions. 2

3. Mitosis
Chapter 5.1: The Cell Cycle and Mitosis pp 3

4. Mitosis What is mitosis? What is the end result of mitosis?
mitosis: the second and shortest stage of the cell cycle; the process in which the duplicated contents of the cell’s nucleus divides into two equal parts
occurs in order for organisms to grow and develop
What is the end result of mitosis?
2 daughter nuclei, each with the same number
and kinds of chromosomes as the original cell. 4

5. Chromosomes in early stage of Mitosis
sister chromatids:
formed when DNA replicates during interphase and joined together by a centromere.
centromere:
the structure that joins two sister chromatids together.
p. 156 5

6. Phases of Mitosis Early prophase 2) Late prophase 3) Metaphase
4) Anaphase
5) Telophase
p. 156-
157 6

7. 1) Early prophase
Replicated chromosomes coil up into an ‘X’ and become visible under a light microscope
Nucleolus disappears
Nuclear membrane begins to break down
Spindle fibers (tiny tube-like structures made of protein) begin to form in plant and animal cells 7

8. 2) Late prophase Spindle fibers complete forming.
Chromosomes attach to the spindle fibers at their centromeres.
Nuclear membrane disappears.
centromere
spindle fibers 8

9. Chromosomes at the equator
3) Metaphase
Spindle fibers tug X-shaped chromosomes.
The duplicated chromosomes line up across the middle of the cell.
Chromosomes at the equator 9

10. 4) Anaphase
The duplicated chromosomes move apart to opposite ends of the cell.
Pole 10

11. 5) Telophase
Nucleolus
A nuclear membrane forms around the chromosomes at the opposite ends of the dividing cell.
One complete set of chromosomes now at each pole of the cell.
Spindle fibers begin to disappear.
A nucleolus appears within each nucleus.
Cell is now ready to divide.
Nuclear membrane 11

12. Review – Name that phase!
Prophase 12

13. Review – Name that phase!
Anaphase 13

14. Review – Name that phase!
Metaphase 14

15. Review – Name that phase!
Telophase 15

16. Summary Mitosis: 1 parent cell 2 daughter cells
Mitosis occurs regularly in tissues that require new cells.
Mitosis allows for an organism to grow and develop over its lifespan and replenishes dead or dying cells in certain tissues. 16