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Cell Division 8.2 (p. 148-151). Binary fission = prokaryotic cell (e.g. bacterium) splits into 2 identical cells Single, circular chromosome is copied Cell grows then divides into 2 identical cells (asexual). Cell Division 8.2 (p. 148-151). - PowerPoint PPT Presentation
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Cell Division 8.2 (p. 148-151)
•Binary fission = prokaryotic cell (e.g. bacterium) splits into 2 identical cells
Single, circular chromosome is copied
Cell grows then divides into 2 identical cells (asexual)
Cell Division 8.2 (p. 148-151)
•Cell cycle = repeating set of events of a eukaryotic cell
INTERPHASE = between phase
PROPHASE = before phaseMETAPHASE = next to each
other phaseANAPHASE = opposite
phaseTELOPHASE = reorganize
phase
IPMAT
Cell Division 8.2 (p. 148-151)
•Mitosis = division of the cell into 2 identical copies (P,M,A,T)
Sexually reproducing organisms
Cell Division 8.2 (p. 148-151)
•Interphase = time between cell divisions
Most of cell’s life spent in interphase
Cell grows (G1 phase)Cell makes a full copy of
the DNA (S phase)Cell prepares to divide (G2
phase)
What are the 3 subphases of Interphase?
Cell Division 8.2 (p. 148-151)
•Prophase = 1st phase of mitosis (preparation)
DNA shortens and coils into tight chromosomes (pair of socks)
Nuclear membrane disappears
Centrosomes form at opposite poles of cell
Spindle fibers attach like strings to the centromeres to pull chromosomes apart
What is the difference between centromeres and centrosomes?
Cell Division 8.2 (p. 148-151)
•Metaphase = spindle fibers move the chromosomes to the equator of the cell
Where is the equator of the cell?
Cell Division 8.2 (p. 148-151)
•Anaphase = spindle fibers pull chromatids toward opposite polesWhere are the poles
of a cell?
Cell Division 8.2 (p. 148-151)
•Telophase = chromatids loosen coils and nucleus begins to form again
Cytokinesis = cell pinches in middle to separate into 2
In plant cells a new cell wall forms in the middle
Cell Division 8.2 (p. 148-151)
Cell Division 8.2 (p. 148-151)