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AP Biology

AP Biology. The Cell Cycle Part 2. Centrioles. Interphase. Before and after the S phase. Interphase cell (Look at the chromatin in the blue nucleus and the yellow cytoskeleton.). Start of Mitosis. Cell in Prophase. Mitosis “Division of the nucleus”. Cell in Metaphase.

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AP Biology

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  1. AP Biology The Cell Cycle Part 2

  2. Centrioles

  3. Interphase

  4. Before and after the S phase

  5. Interphase cell (Look at the chromatin in the blue nucleus and the yellow cytoskeleton.)

  6. Start of Mitosis

  7. Cell in Prophase

  8. Mitosis “Division of the nucleus”

  9. Cell in Metaphase

  10. Cell in Anaphase

  11. Cell in Telophase and starting Cytokinesis

  12. One cell becoming two

  13. Chromosome movement Motor Protein and the Spindle Fibers Kinetochore Tubulin subunits Motor protein Microtubule Chromosome

  14. Animal vs. Plant

  15. Chromatin condensing Nucleus 10 µm Chromosomes Cell plate Nucleolus LE 12-10 Prometaphase. We now see discrete chromosomes; each consists of two identical sister chromatids. Later in prometaphase, the nuclear envelope will fragment. Prophase. The chromatin is condensing. The nucleolus is beginning to disappear. Although not yet visible in the micrograph, the mitotic spindle is starting to form. Metaphase. The spindle is complete, and the chromosomes, attached to microtubules at their kinetochores, are all at the metaphase plate. Telophase. Daughter nuclei are forming. Meanwhile, cytokinesis has started: The cell plate, which will divide the cytoplasm in two, is growing toward the perimeter of the parent cell. Anaphase. The chromatids of each chromosome have separated, and the daughter chromosomes are moving to the ends of the cell as their kinetochore micro- tubules shorten.

  16. Microscopic view of Mitosis in Onion root tips.Can you identify the stages?

  17. Checkpoints(Is all going according to plan?)

  18. Question: All organisms must be able to reproduce to keep the species existent. Prokaryotes undergo Binary Fission and Eukaryotic cells undergo Mitosis. In no more than four sentences, explain one similarity and one difference between the two processes. In addition, explain the evolution link between the two processes. (5 Points)

  19. Scoring Rubric: 1pt. Discussion of one similiarity – Cytokinesis, DNA synthesis (S), or Maturion (G1) • 1pt. Discussion of one difference – G2 or Mitosis • 1pt. Discussion of Binary fission being first and evolving into Mitosis as DNA and organisms became more complex over time. • 1pt. Correct use of scientific terms. • 1pt. Answer has no more than three sentences. (Following Directions.) • This question addresses Essential Knowledge: 1.B.1

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