CELL CYCLE Chapter 10 Mitosis. Did you know… A healthy adult human produces ____________ new cells every second! 25 million Not a flashcard.

Presentation on theme: "CELL CYCLE Chapter 10 Mitosis. Did you know… A healthy adult human produces ____________ new cells every second! 25 million Not a flashcard."— Presentation transcript:

1 CELL CYCLE Chapter 10 Mitosis

2 Did you know… A healthy adult human produces ____________ new cells every second! 25 million Not a flashcard.

3 Why do cells divide? Growth Repair/Regenerate Reproduction

4 The Cell Cycle Not a flashcard.

5 CELL CYCLE Click here: cells alive cell cyclecells alive cell cycle The cell cycle makes 2 cells that are exactly the same!!! Not a flashcard.

6 5 Phases of the Cell Cycle –Interphase –Prophase –Metaphase –Anaphase –Telophase Mitosis Remember: I Peed on the MAT!

7 Animation

8 INTERPHASE In between divisions Cells are in this phase most of the time See nucleus because DNA is spread out as chromatin Z Can’t see individual chromosomes DNA & cytoplasm is doubled

9 PROPHASE 1 st dividing phase DNA scrunches into chromosomes Nuclear membrane disappears Centrioles produce spindle fibers

10 METAPHASE Chromosomes line up in the middle

11 ANAPHASE Centrioles pull chromosomes apart

12 TELOPHASE See two nuclei Nuclear membrane returns Spindle breaks down Chromosomes spread out into chromatin

13 Not a flashcard.

14 CYTOKINESIS Cytoplasm splits into two cells In Plants: A cell plate is formed. In Animals: cleavage furrow A cleavage furrow is formed.

15 Cytokinesis in plants cell plate Not a flashcard.

16 Cytokinesis in Animals Cleavage furrow Not a flashcard.

17 The Cell Cycle Not a flashcard.

18 What Phases Can You See? Not a flashcard.

19 Find the stages of mitosis in these onion cells: Not a flashcard.

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21 Animation

22 Not a flashcard.

23 Cell Cycle-click here! Not a flashcard.

24 The 5 Phases Not a flashcard.

25 CHROMOSOMES Not a flashcard.

26 Chromosome structure ______________________ 2 identical arms __________________ constricted area holds chromatids together __________________ PAIR 2 of each chromosome (one from mom; one from dad) ‘sister’ CHROMATIDS CENTROMERE HOMOLOGOUS 3 flashcards

27 DNA can appear in 2 forms ______________ Spread out when cells are NOT dividing. _________________ Scrunched up in bundles as when cells divide. CHROMATIN CHROMOSOMES

28 Cancer cells Don’t stop dividing ***Like a car with no brakes! Can spread to new places ______________ damage DNA Ex: Radiation, cigarette smoke, chemicals in environment Carcinogens

29 Cancer cell may divide indefinitely if they have a continual supply of nutrients! *In contrast, nearly all mammalian cells divide 20 to 50 times under culture conditions before they stop, age, and die. Did you know…? –Cancer cells may be “immortal” Cells from a tumor removed from a woman (Henrietta Lacks) in 1951 are still reproducing in culture! Not a flashcard.

30 CANCER Not a flashcard.

31 Smoking leads to cancer. Not a flashcard.

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