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10.2 Mitosis Notes
Eukaryotic Cell Cycle - 5 stages - how somatic (body) cells divide
INTERPHASE:
the longest phase - most cells are in this phase. The cell is not dividing
but is growing and preparing to divide.
1. G 1 - Gap 1 - cell growing rapidly and building more organelles - stays in G 1 if not
dividing.
•.
2. S - Synthesis phase - DNA is copied, chromosomes are 2 sister chromatids attached
by a centromere.
3. G2 - Gap 2 - Continues growing and building structures
CELL DIVISION:
for division.
1 cell divides into 2 identical daughter cells
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4. Mitosis - nucleus and DNA divide
5. Cytokinesis - cytoplasm and organelles divide
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G2
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preparation
for mitosis)
MITOSIS - 4 Stages
1 Prophase - mitosis begins, centrioles and spindle fibers appear
2. Metaphase - chromosomes line up in middle of cell, attach to spindle fibers
3. Anaphase - spindle fibers shorten, pulling chromatids apart to opposite poles
.4. Telophase -:-nuclear envelope forms around set of chromosomes at each end,
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chromosomes uncoil, spindle fibers disappear.
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