16LE 12-10 Chromatin condensing Nucleus Chromosomes Cell plate 10 µm NucleolusProphase. Thechromatin 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; eachconsists of two identical sister chromatids. Laterin prometaphase, thenuclear envelope will fragment.Metaphase. The spindle is complete, and the chromosomes, attached to microtubules at their kinetochores, are all atthe metaphase plate.Anaphase. Thechromatids 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.
17Microscopic view of Mitosis in Onion root tips Microscopic view of Mitosis in Onion root tips. Can you identify the stages?
19Question: 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)
20Scoring Rubric: 1pt. Discussion of one similiarity – Cytokinesis, DNA synthesis (S), or Maturion (G1)1pt. Discussion of one difference – G2 or Mitosis1pt. 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