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Ch 10 Mitosis

Ch 10 Mitosis. Cell Growth. Limits to Cell Growth Why do cells divide? The larger a cell gets, the more demands the cell puts on the DNA. Cell Growth. Before a cell gets too big, it divides forming two identical “daughter cells”. Cell Division.

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Ch 10 Mitosis

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  1. Ch 10 Mitosis

  2. Cell Growth • Limits to Cell Growth • Why do cells divide? • The larger a cell gets, the more demands the cell puts on the DNA

  3. Cell Growth Before a cell gets too big, it divides forming two identical “daughter cells”

  4. Cell Division • Every cell must copy its DNA before cell division begins. • Each daughter cell then gets a copy of that DNA • In eukaryotes, cell division begins with the division of the nucleus called mitosis.

  5. Chromosomes • Genetic information is passed on by chromosomes • Chromosomes are made of DNA • Each chromosome is made of 2 sister chromatids and joined at the centromere.

  6. Chromosomes • When a cell is not in cell division, the DNA is found in the form of chromatin, not as chromosomes. • DNA condenses to form chromosomes before cell division.

  7. The Cell Cycle • During the cell cycle a cell grows, prepares for division, and divides to form two daughter cells, each of which begins the cycle again. • Interphase – Cell is preparing for division (G1, S, and G2 phase) • AFTER Interphase, Mitosis begins. The daughter cells then enter Interphase. **CYCLE**

  8. Cell Cycle Animation Cell Cycle Animation p.2

  9. Mitosis (PMAT) **Mitosis occurs in Somatic Cells (body cells) when new cells are needed.** • 1. Prophase • Chromosomes condense and become visible • Centrioles separate and get on opposite sides of the nucleus • Centrioles help to organize the spindle fibers

  10. Mitosis (PMAT) • 2. Metaphase • Chromosomes line up across the center of the cell

  11. Mitosis (PMAT) • 3. Anaphase • The centromeres that holds the chromatids together split • The spindle helps pull the pair of chromosomes apart

  12. Mitosis (PMAT) • 4. Telophase • Chromosomes gather at opposite ends of the cell • Two new nuclear envelopes form

  13. Mitosis

  14. Uncontrolled Cell Growth • Cancerous tumors are caused because cancer cells do not respond to the signals that regulate the growth of most cells.

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