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Mitosis & Cytokinesis Cell Growth and Reproduction Ch. 8.2.

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Presentation on theme: "Mitosis & Cytokinesis Cell Growth and Reproduction Ch. 8.2."— Presentation transcript:

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2 Mitosis & Cytokinesis Cell Growth and Reproduction Ch. 8.2

3 Why do cells divide by Mitosis ? Growth &Repair Reproduction of single celled organisms under? conditions constant environment Amobea Reproducing

4 Cells dividing by Mitosis……. Identical to original cell Same chromosome # Identical chromosome makeup Skin

5 Cell Cycle 24 hours G or Growth 1 phase S or DNA Synthesis Growth 2 M or Mitosis phase //////

6 Where is DNA located ? 1. Nucleus 2. Chromosomes DNA

7 Duplicated Chromosome (Late Interphase): Sister Chromatids Centromere

8 Spindle & spindle fibers: Pull apart the sister chromatids Spindle fibers

9 Cytokinesis :cells cytoplasm divides & splits apart

10 Stages of Mitotic Cell Division Prophase Metaphase Anaphase Telophase 1st middle apart far or separate

11 Interphase Intermission Normal metabolic activities Major state DNA= chromatin

12 Late Interphase Prepares for mitosis DNA doubles= Sister chromatids Centrioles double in animals

13 Prophase Nuclear membrane disappears Doubled DNA = condensed chromosomes Spindle fibers

14 Metaphase Chromoso mes line up mid- cell Facing inward

15 Anaphase Chromosomes move to opposite poles at Centrioles in animals Spindle apparatus in plants

16 Telophase Cells divide Cell plate or membranes form Nucleus reappears

17 Returns to Interphase Intermission Normal metabolic activities Major state DNA=chromatin

18 Plant versus Animal Mitosis Plant: Cell wall from cell plate in telophase Sindles Animal: No cell wall membrane cytokinesis Centrioles

19 Animal Telophase Interphase

20 Plant Anaphase Interphase

21 Cancerous cells ……... 1.Divide too many times 2.Divide into more than two cells! Masses of cells = tumors benign malignant


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