1. Cell Division Cell division allows organism to grow , repair damaged structures, and reproduce.
10.5
What are the functions of cell division?
What happens during the cell cycle?

3. 1 30 2 60 ( 1 hour) 4 90 8 120 ( 2 hours) 16 150 32 180 (3 hours) 64
Time
Number of Cells 1 30 2
( 1 hour) 4 90 8
120 ( 2 hours) 16
150 32
180 (3 hours) 64

4. Reproduce Repair Damaged Cells Grow
Cell Division allows organisms to
Repair
Damaged
Cells
Grow

5. What happens During the Cell Cycle?
Scroll down to mitosis and cell division 3:36
During the cell cycle, a cell grows, prepares for division, and divides into two new cells, which are called “daughter cells”.
Cell Cycle
Stage 1: Interphase
This is the stage before
cell divison. The cell grows, makes an exact copy of its DNA in its nucleus in a process called
replication ,
and prepares
to divide into two cells.

6. Centrioles Pairs
Centrioles
Structures that help an animal cell divide into two new cells.
The centrioles are duplicated.

7. Chromosomes
Threadlike structures made of DNA and protein within the nucleus are called chromosomes. At the end of replication, the cell contains two identical sets of chromosomes.

8. Stage 2:Mitosislong version (15:00)
Mitoisis consists of 4 phases: Remember “PMAT”
Prophase * Metaphase * Anaphase * Telophase
Short version – 1:18

9. Prophase Chromosomes in the nucleus condense.
The pairs of centrioles move to opposite sides of the nucleus.
Spindle fibers form bridge between the ends of the cell.
The nuclear envelope breaks down.

10. Metaphase Each chromosome attaches to a spindle fiber
at its centromere.
What is missing from the cell???
Nucleus
What happened to the chromosomes?
They moved to the center of the cell.

11. Anaphase
The centromere of each chromosome splits, pulling down the chromatids apart.
Each chromatid is now a single, unreplicated chromosome.
These chromosomes are drawn by their spindle fibers to opposite ends of the cell. The cell stretches out.

12. The last phase of mitosis
Telephase
The last phase of mitosis
The chromosomes decondense .
The nuclear envelope forms around the the 2 separate nuclei.
Cell is pinching in around its middle

13. Stage 3: Cytokinesis
As cytokinesis continues, the cell splits into two daughter cells.
Each daughter cell ends up with an identical set of chromosomes and
about half the organelles of the parent cell.

16. Plant with roots
Polar Bear and Baby
Wounded Thumb
Chromosome
Stages of Mitosis

17. Discovery Education (all videos)
Prophase
Metaphase
Anaphase
Telophase