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mitosis
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Ch. 3.1 Cell Cycle & Cell Division
Focus Questions:
1. What are the phases of cell cycle?
2. What happens to the DNA during the cell cycle?
3. What happens during the mitotic phase?
4. Why is cell division important?
1. What are the phases of cell cycle?
1. What are the phases of cell cycle?
Cell cycle
Interphase
(growth & development)
G1 stage:
Rapid growth (some cells stop here)
S stage:
growth & DNA copied
G2 stage:
growth & storing energy for division
Mitotic phase
(cell division)
Mitosis:
Division of nucleus
Cytokinesis:
division of cytoplasm
Organ
elle
s rep
licate
Interphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
2. What happens to the DNA during the cell cycle?
1. Interphase – DNA is copied during S stage
2. DNA coils up into chromosomes
3. Identical chromosomes pair up to form a duplicated chromosome (with 2 sister chromatids)
2. What happens to the DNA during the cell cycle?
4. During mitotic phase, sister chromatids will divide into 2 cells
Cell Cycle Sort
• Separate into 3 piles: terms, definition, & pictures
• Put the pictures into the correct order
• Match the definitions to the pictures
• After, use your book (pg. 90-91) to check the order and to add the terms
• Create a 6-tab foldable:– Outside of tab: Draw picture
– Inside of tab: Write term with definition
3. What happens during the mitotic phase?
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Mitosis
(nucleus &
DNA
divides)
Cytoplasm & rest
of cell divides
Prophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles
Metaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Anaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Telophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Cytokinesis
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
4. Why is cell division important?
• Reproduction – unicellular organisms
• Growth & development
• Replacement – replaces old & worn out cells
• Repair – from injuries & other damage
