Ch 10 mitosis
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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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Ch 10 mitosis

Ch 10 Mitosis


Cell growth

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 growth1

Cell Growth

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


Cell division

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.


Chromosomes

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.


Chromosomes1

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.


The cell cycle

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**


Ch 10 mitosis

Cell Cycle Animation

Cell Cycle Animation p.2


Mitosis pmat

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


Mitosis pmat1

Mitosis (PMAT)

  • 2. Metaphase

    • Chromosomes line up across the center of the cell


Mitosis pmat2

Mitosis (PMAT)

  • 3. Anaphase

    • The centromeres that holds the chromatids together split

    • The spindle helps pull the pair of chromosomes apart


Mitosis pmat3

Mitosis (PMAT)

  • 4. Telophase

    • Chromosomes gather at opposite ends of the cell

    • Two new nuclear envelopes form


Mitosis

Mitosis


Uncontrolled cell growth

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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