1. The Cell Theory & Mitosis

2. The Cell Theory All organisms are made up of one or more cells.
Cells are the basic unit of structure and function in all organisms.
All cells come from cells that already exist.

3. All organisms are made up of one or more cells.
Unicellular
Multicellular

4. Cells are the basic unit of structure and function in living things.
Cells are the building blocks of living things like concrete blocks are the building blocks of houses.

5. All cells come from cells that already exist.
This is where cell division and mitosis come into play.

6. How does the cell know how to divide?
Cell Division
Reproduction
Growth
Repair
Why do cells divide?
How does the cell know how to divide?
The DNA has the instructions for all of the cell’s activities.

7. Cell Cycle 3 Parts The sequence of development and division of a cell
Interphase - Preparation
Mitosis – Cell division
Cytokinesis – Splitting
Adult human cell: ~24 hrs
18-20 hours in interphase
2 hours in mitosis
Embryonic cells: 30 min.
How long does it take?

8. Interphase What happens Cell doubles in size DNA replicates
Organelles double in number

9. Mitosis: PROPHASE What happens DNA forms chromosomes Spindle forms
Centrioles move toward opposite poles
Nuclear membrane begins to disappear

10. Mitosis: METAPHASE What happens Nucleus has disappeared completely
Chromosomes line up in the middle of the cell “equator”

11. Mitosis: ANAPHASE What happens Centromeres divide
Chromatids separate and move to opposite poles

12. Mitosis: TELOPHASE What happens
Nuclear membrane forms around each group of chromosomes
Chromosomes unwind
Cytokinesis begins

13. Cytokinesis
Cytoplasm divides
One cell becomes 2 cells
What happens

14. Learning Scale
4 - Explain how you would justify each part of the cell theory.
3 - Explain the role of DNA in the cell.
2 - Describe the parts of the cell theory.
1 - Identify the levels of organization.