cell division 8.2 (p. 148-151)

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)