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Cellular Reproduction

Cellular Reproduction. Cell Division cellular material is divided between new daughter cells Nuclear division: Mitosis or Meiosis Cytoplasmic division: Cytokinesis. Nuclear division retaining the original chromosome number. Mitosis and Meiosis in the Human Life Cycle.

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Cellular Reproduction

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  1. Cellular Reproduction Cell Division cellular material is divided between new daughter cells Nuclear division: Mitosis or Meiosis Cytoplasmic division: Cytokinesis

  2. Nuclear divisionretaining the original chromosome number Mitosis and Meiosis in the Human Life Cycle Nuclear divisionreducing the chromosome number,leading to sperm or eggs

  3. Mitosis P M A G2 T assembly of components for division S G1 cytoplasm doubles chromosomes replicate Interphase Cell Cycle with Mitosis Mitosis P = prophase M = metaphase A = anaphase T = telophase cytokinesis Interphase G1 = growth phase 1 S = synthesis phase G2 = growth phase 2

  4. When does nuclear division occur? When are the chromosomes duplicated? When do the cytoplasmic contents double? G1 S G2 Mitosis Cytokinesis Applying Your Knowledge

  5. Interphase nucleus nucleolus Chromatin is diffuse, individual chromosomes cannot be distinguished.

  6. Prophase Chromosomes condense. Spindle forms. Nucleolus disappears. Nuclear envelope breaks down.

  7. centromere chromatid chromatid Sister Chromatids are held together at their centromeres. Each chromosome appears as a pair of chromatids attached at the centromere.

  8. Metaphase Chromatid pairs align at the cell equator.

  9. Anaphase Sister chromatids separate and are drawn to opposite poles by spindle fibers.

  10. Telophase Chromosomes have reached poles of cell. Spindle disperses. Nuclear envelope surrounds chromosomes. Chromosomes become diffuse, nucleolus reforms.

  11. Telophase +Cytokinesis New Daughter Cells These phases can overlap in time.

  12. Cytokinesis in animal cells Cytokinesis in plant cells

  13. When do chromosomes line up at the cell equator? When are sister chromatids first visible? When do sister chromatids separate from each other? Prophase Metaphase Anaphase Telophase Applying Your Knowledge

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