AP Biology The Cell Cycle Part 2. Centrioles Interphase.
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Transcript of AP Biology The Cell Cycle Part 2. Centrioles Interphase.
AP Biology
The Cell CyclePart 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
Cell in Anaphase
Cell in Telophase and starting Cytokinesis
One cell becoming two
Motor Protein and the Spindle Fibers
Chromosomemovement
Microtubule Motorprotein
Chromosome
Kinetochore
Tubulinsubunits
Animal vs. Plant
LE 12-10
NucleusCell plateChromosomesNucleolus
Chromatincondensing 10 µm
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.
Prometaphase. Wenow see discrete chromosomes; each consists of two identical sister chromatids. Laterin prometaphase, the nuclear envelope will fragment.
Metaphase. The spindle is complete, and the chromosomes, attached to microtubules at their kinetochores, are all at the metaphase plate.
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.
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.
Microscopic view of Mitosis in Onion root tips.Can you identify the stages?
Checkpoints(Is all going according to plan?)
• 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)
•
• 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