1. The Cell Cycle
Period of time from the beginning of 1 division to the next
Some cells stop dividing after full development of an organism
Heart; Brain
Some cells are constantly dividing
Skin; intestines
Time for the cell cycle: 3o minutes to 2o hours in humans

2. The Cell Cycle - Interphase
Period of time where cell performs “normal” activities except reproduction
Inter = between; “resting phase”
Cell spends most time in Interphase
DNA & proteins seen as chromatin
DNA controls cell activities
Can be split into 3 phases:
G1: Cell grows; does normal activities
S: Synthesizes chromatin (amount is doubled) and organelles
G2: Cell grows more; normal activities; prepares for mitosis

3. The Cell Cycle - Mitosis
Nuclear division of the cell (dividing the nucleus)
Can be split into 4 phases: PMAT
Prophase: DNA condensed into chromosomes; nuclear envelope starts to breakdown
Metaphase: centromeres line up at the equator of the cell
Anaphase: chromosomes pulled apart to poles
Telophase: nuclear envelope reforms; chromosomes at the poles

4. The Cell Cycle - Cytokinesis
Division of the cytoplasm
Forms 2 identical daughter cells
In animal cells: cell membrane is pinched, making cells with a complete set of chromosomes Pinched area is called a Cleavage Furrow
In plant cells: vesicles create a line across the cell in the middle of the 2 nuclei
This line is the Cell Plate

5. Mitosis Pictures Project
Key:
Centrioles
Chromatin
Chromosomes
Spindle Fibers

6. Mitosis Pictures Project: Interphase G1 Interphase S-G2