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Mitosis (cell division) O…M…G…. More notes? Sweet! I’m telling you, Captain Science, there is nothing I would rather do than take notes on a Monday morning.

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Presentation on theme: "Mitosis (cell division) O…M…G…. More notes? Sweet! I’m telling you, Captain Science, there is nothing I would rather do than take notes on a Monday morning."— Presentation transcript:

1 Mitosis (cell division) O…M…G…. More notes? Sweet! I’m telling you, Captain Science, there is nothing I would rather do than take notes on a Monday morning. I was thinking the best thing about today was going to be food, but this is soooo much better. Well…except for chocolate. It’s not quite as good as that, but close. (It’s definitely better than white chocolate, but that’s not really chocolate anyhow. It’s just yogurt pretending to be chocolate. Gross. And speaking of chocolate, Mr. Mason likes dark chocolate. Just FYI.) Anyhow…yeah! Notes! Woohoo!!!

2 Why do cells need to divide?

3 The work of the cell occurs at the boundaries.

4 Why do cells need to divide? The work of the cell occurs at the boundaries. What if Anchorage doubled in size but it didn’t add any new roads, airports, or ports? What if it tripled in size?

5 Mitosis Mitosis – The process of cell replication in somatic (body) cells

6 The Cell Cycle

7 Interphase Cell spends the majority of life in interphase

8 Interphase Cell spends the majority of life in interphase – G 1 : Cells grow to mature size (growth phase)

9 Interphase Cell spends the majority of life in interphase – G 1 : Cells grow to mature size (growth phase) – S: Cell’s DNA is copied (synthesis phase)

10 Interphase Cell spends the majority of life in interphase – G 1 : Cells grow to mature size (growth phase) – S: Cell’s DNA is copied (synthesis phase) – G 2 : Cell prepares for division

11 Interphase Cell spends the majority of life in interphase – G 1 : Cells grow to mature size (growth phase) – S: Cell’s DNA is copied (synthesis phase) – G 2 : Cell prepares for division – G 0 : ???

12 Interphase Cell spends the majority of life in interphase – G 1 : Cells grow to mature size (growth phase) – S: Cell’s DNA is copied (synthesis phase) – G 2 : Cell prepares for division – G 0 : Cell exits cell cycle. Cells are not copying DNA or preparing to divide. (The vast majority of the body’s cells are in G 0, simply doing their job instead of preparing to divide.)

13 Mitosis Mitosis – The actual process of division, broken into 5 steps: – Prophase – Metaphase – Anaphase – Telophase – Cytokinesis

14 1. Prophase Chromatin (loose, uncoiled DNA) coils into tightly wound chromosomes Sister chromatids (identical copies of chromosomes) held together by a centromere. Nulear membrane breaks down and disappears. Centrioles move to opposite poles and spindle fibers start to extend.

15 Prophase

16 2. Metaphase Chromosomes move to the equator of the cell Spindle fibers connect to chromosomes at the centromere

17 3. Anaphase The sister chromatids separate and move towards the opposite poles, pulled by shortening spindle fibers

18 4. Telophase Chromatids reach the opposite ends of cell Mitotic spindle disappears Chromosomes start to uncoil into chromatin Nuclear envelope starts to reform

19 Telophase

20 Cytokinesis Cell membrane pinches inward at the cleavage furrow*, eventually splitting the one original cell into two daughter cells (*no furrow evident in plant cells)

21 Cytokinesis


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