Bio Lab 2.16
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sequence of events extending from the time a cell is formed until its own divsion into two cells
Growing Phase. 90% of time.
Cell Division. 10% of time.
This controls the cell cycle. if it fails this leads into Cancer.
Uncontrolled cell growth.
Arise from epithelial tissues. ex. Lung cancer, skin cancer.
Arise from connective tissue. ex. Bone cancer
Benign vs. Malignant.
Malignant - spreads. Metastasis in lungs and liver.
- 3 Phases:
- a) G1- Growth
- b) S - Synthesis (DNA is doubled)
- c) G2 - Keeps growing
Stages in Mitosis
- A) Prophase - Chromatin condenses into chromosomes, mitotic spindle appears.
- B) Metaphase- Chromosomes are arranged at the equelateral plate (imaginary line in middle), mitotic spindle fully formed (seperate chormosomes).
- C) Anaphase- Chromosomes Seperate
- D) Opposite of prophase... Chromosomes unfold into chormatin & mitotic spindle dissapears
Uncoiled DNA (alot of long strands inside the nucleus)
Doesn't pinch in b/c it has of cell wall. so a new wall is formed in the middle and thats how they are separated (cleavage)
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