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MitosisOnion Root Tip
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Most of the cells look like this. Your assignment is to find cells that look different. Draw as many different looking cells as you can find!
Mitosis
Cell division occurs in a series of stages or phases.
Mitosis
Replication and division of the nucleus
It insures that each of the cells has a complete set of DNA
“chromosomes”
Interphase(cell is doing its normal function)
• Nucleus and nucleolus visible
• chromatin (chromosomes NOT visible)
• Nuclear membrane intact
• DNA replicates
animal cell
plant cell
plant cell
interphase Prophase metaphase anaphase Telophase
Prophase
• Nuclear membrane and nucleolus dissolve
• Chromatin condensing into visible chromosomes
• In animal cells centrioles move to opposite poles
centrioles
plant cell
Metaphase
• Spindles line up chromosomes in center of cell
• Asters appear in animal cells
plant cell
Anaphase
• Centromeres separate• Chromosomes are pulled
toward poles by spindles
plant cell
Telophase
• Chromosomes uncoil into chromatin
• Nuclear membranes reform• Nucleolus reappear• Centrioles replicate• Cytokinesis occurs-division of
cytoplasm
– Animal cell- membrane pinches
– Plant cell- cell wall forms inside out
plant cell
Daughter Cell
• Two smaller cells are formed with the exact same chromosomes as the parent cell
• Cells are back in interphase
Daughter Cells
plant cell
whitefish
animal mitosis
Cells spend a small amount of time doing mitosis, the rest of the cell cycle is spent in interphase.
Cell cycle