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Cell Cycle Cell Growth and Division. 2. Why do cells divide? If the cell is too big: If the cell is too big: Too much demand is placed DNA Too much demand.

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Presentation on theme: "Cell Cycle Cell Growth and Division. 2. Why do cells divide? If the cell is too big: If the cell is too big: Too much demand is placed DNA Too much demand."— Presentation transcript:

1 Cell Cycle Cell Growth and Division

2 2. Why do cells divide? If the cell is too big: If the cell is too big: Too much demand is placed DNA Too much demand is placed DNA Harder to move enough nutrients and wastes across the cell membrane Harder to move enough nutrients and wastes across the cell membrane

3 Surface area vs. volume

4 4. Surface Area vs. Volume As a cell increases in size, volume increases faster than surface area As a cell increases in size, volume increases faster than surface area This causes the ratio of surface area to volume to decrease. This causes the ratio of surface area to volume to decrease. This is a serious problem for the cell and is why the cell cannot grow any larger than it does. This is a serious problem for the cell and is why the cell cannot grow any larger than it does.

5 5. Cell division solves those problems Before a cell becomes too large, a growing cell replicates its DNA and then divides into two new daughter cells. This is called mitosis. Before a cell becomes too large, a growing cell replicates its DNA and then divides into two new daughter cells. This is called mitosis.

6 Cell Cycle

7 Main Events of a Cell Cycle Interphase Interphase G1, G1, S G2 G2 M Phase M Phase Prophase Prophase Metaphase Metaphase Anaphase Anaphase Telophase Telophase

8 Interphase The cell grows and replicates its DNA The cell grows and replicates its DNA Chromosomes are not visible, only chromatin Chromosomes are not visible, only chromatin

9 Prophase Chromatin condenses into chromosomes Chromatin condenses into chromosomes Centrioles separate Centrioles separate Nuclear envelope breaks down Nuclear envelope breaks down

10 Metaphase Chromosomes line up across the center of the cell Chromosomes line up across the center of the cell

11 Anaphase Chromosomes are pulled apart by spindle into individual chromatids Chromosomes are pulled apart by spindle into individual chromatids

12 Telophase Chromosomes gather at opposite ends of the cell Chromosomes gather at opposite ends of the cell Two new nuclear envelopes form Two new nuclear envelopes form

13 Cytokinesis The cytoplasm pinches in half The cytoplasm pinches in half Plants lay down a cell plate Plants lay down a cell plate Two new cells now exist. Two new cells now exist.

14 Label the stages #7

15 What stops cell from growing? Proximity to neighbor cells. Proximity to neighbor cells. Cells in a petri dish will continue to grow until they come into contact with other cells. Cells in a petri dish will continue to grow until they come into contact with other cells. Similarily, skin around a wound. Similarily, skin around a wound.

16 Which chemicals regulate the cell cycle?

17 How do cells respond to contact with other cells?

18 How are cancer cells different from other cells?


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