1. The Cell Cycle

2. Where do cells come from?

3. The Cell Theory All living things are made of cells
Cells are the basic organizational unit of life.
Cells must come from other cells.

4. Simple cell division

5. Fun facts…
The human body must make an average of 610 billion blood cells per day.
200,000,000,000 red cells per day
10,000,000,000 white cells per day
400,000,000,000 platelets per day
The human body is made of about 100 trillion cells.

6. The Cell Cycle
The cell has a life cycle called the cell cycle.

7. The Cell Cycle The cell cycle can simply be divided into 2 parts
Interphase
Mitosis

8. The Cell Cycle
Interphase
Mitosis

9. Interphase Cells spend the majority of their time in interphase.
DNA is copied during this time

10. Interphase

11. Copying the DNA Chromatids
Centromere holds the copied chromosome together
Chromatin is un-wound DNA
Chromosome that has not been copied.
Copied Chromosome

12. Mitosis
Mitosis is when the nucleus of a cell divides into 2 new nuclei

13. So, what are the steps to mitosis?
Prophase
Metaphase
Anaphase
Telophase
Easy way to remember: P-MAT

14. Prophase Chromatids are visible in nucleus. Nuclear membrane dissolves
Spindle fibers stretch towards the nucleus
Chromatids
Centromere holds the copied chromosome together
Copied Chromosome
Chromosome that has not been copied.

16. Metaphase
Chromatid pairs line up along the center of the cell.

18. Anaphase
Chromosomes separate.

20. Telophase
Cytoplasm separates
New nuclei form in each cell

22. When does Mitosis happen?
When a cell needs to be replaced:
When an organism is growing
After an injury where cells are lost
To maintain a living organism (once it is adult size)

23. Why does Mitosis happen?
Because there needs to be a way to make more cells