Mitosis - The division of
the nucleus that results in identical complete copies of chromosmes packaged
into two new nuclei
Cytokinesis - The division of the cytoplasm that results in two daughter cells
Why do Cells Divide?
Some Cells never divide, others divide frequently.
The Cell Cycle
Mitosis
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Interphase (technically not part of mitosis, but it is included in the cell cycle) Cell is in a resting phase, performing cell functions DNA replicates (copies) Organelles double in number, to prepare for division
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Prophase Spindle forms Centrioles move to opposite poles Chromosomes become visible Nuclear membrane breaks down in prometaphase |
Prometaphase Microtubules of spindle attach to kinetochore on chromosomes
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Metaphase Chromosomes line up along the equator |
Anaphase Centromeres divide Chromatids separate and move to opposite poles |
Telophase Nuclear membrane forms around each group of chromosomes Chromosomes unwind Cytokinesis begins - cell pinches inward and forms two daughter cells. |
**In plant cells, cytokinesis begins when a new cell wall forms between the two new cells.
Numbers Game
Mitosis produces 2 daughter cells
The two daughter cells containt the exact same number of chromosomes as the original parent cell
Daughter cells are DIPLOID
