1. Mitosis:
Mitosis is a type of cell division in which a daughter cell receives the same number of identical chromosomes as the parent cell.
Mitosis is necessary for the growth and repair of organisms.
Orgasms are made of cells.

2. The Cell Cycle
Interphase: Most of a cell’s life. The cell grows & DNA duplicates.
Mitosis: Cell divides. Includes 4 phases.

3. Mitosis

4. The Chromosome
During interphase, the chromosomes exist as chromatin (stringy mass)
Each chromosome is duplicated during interphase
The original chromosome is attached with a centromere to its sister chromatid

5. Stages of Mitosis Prophase
Chromosomes become visible as they shorten and thicken
In animal cells, structures called centrioles move to opposite ends of the cell and provide attachment for spindle fibers
Nuclear membrane begins to disappear.

6. Stages of Mitosis cont. Metaphase
Sister chromatids move toward the equatorial plate (middle)
Spindle fibers are attached to centromeres

7. Stages of Mitosis cont. Anaphase
Centromeres divide and the chromatids, now daughter chromosomes, move to opposite poles of the cell.

8. Stages of Mitosis cont. Telophase Chromosomes become chromatin
Spindle fibers dissolve
Nuclear membrane forms around each set of chromatin
Followed by cytokinesis (division of cytoplasm)

9. Cytokinesis: Cell divides into 2 identical cells
In animal cells
Cleavage furrow develops, pinching off the cell into two
In plant cells
Cell plate forms into a new cell wall

10. Animations