Single, circular chromosome is copied 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 cycle = repeating set of events of a eukaryotic cell Cell Division 8.2 (p. 148-151) Cell cycle = repeating set of events of a eukaryotic cell INTERPHASE = between phase PROPHASE = before phase METAPHASE = next to each other phase ANAPHASE = opposite phase TELOPHASE = reorganize phase I P M A T
Mitosis = division of the cell into 2 identical copies (P,M,A,T) Cell Division 8.2 (p. 148-151) Mitosis = division of the cell into 2 identical copies (P,M,A,T) Sexually reproducing organisms
Interphase = time between cell divisions 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?
Prophase = 1st phase of mitosis (preparation) 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?
Anaphase = spindle fibers pull chromatids toward opposite poles Cell Division 8.2 (p. 148-151) Anaphase = spindle fibers pull chromatids toward opposite poles Where are the poles of a cell?
Telophase = chromatids loosen coils and nucleus begins to form again 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)