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A llium przewalskianum (an Asian species )

Allium amplectens (pink form of this western American onion). A llium przewalskianum (an Asian species ). Allium schoenoprasum 'Snowcap' , a dwarf white-flowered chive. Allium heldreichii (a hardy species from Greece). Investigating Mitosis in Allium Root Tip. 4 Phases of Mitosis.

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A llium przewalskianum (an Asian species )

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  1. Alliumamplectens (pink form of this western American onion) Allium przewalskianum(an Asian species) Alliumschoenoprasum 'Snowcap' , a dwarf white-flowered chive Alliumheldreichii (a hardy species from Greece)

  2. Investigating Mitosis in Allium Root Tip

  3. 4 Phases of Mitosis • Prophase • Metaphase • Anaphase • Telophase and Cytokinesis

  4. Interphase (Pre-Mitosis) Cell prepares for division by: • A cell being a cell • growing, functioning, • replicating DNA and organelles.

  5. Prophase Cell prepares for nuclear division by: • Coiling chromatin into chromosomes • Digesting nuclear membrane • Creating spindle fibers

  6. Metaphase Cell prepares chromosomes for division by: • aligning chromosomes at cell equator • attaching spindle fibers to sister chromatids of each chromosome

  7. Anaphase Chromosomes divide: • Spindle fibers pull chromosomes apart. • Separated chromatids move to opposite ends of the cell.

  8. Telophase/Cytokinesis Cytoplasm divides: • Chromosomes uncoil (revert to chromatin), • two new nuclear membranes form, • ell plate forms to create two daughter cells.

  9. Can you identify the mitosis phases in these cells?  Explore Alliumroot with a microscope. Where was the most growth in this tissue? Try to find cells in mitosis. Can you identify the stage of mitosis for one or more cells?

  10. Parts of the Onion Root • Region of Maturation- where root hairs develop and cells differentiate -------------------------------------> • Region of Elongation- area in which growth occurs -------------------------------------> • Apical Meristem- region containing the highest percentage of cells undergoing mitosis ------------------------------------> • Root Cap- functions in protection -------------------------------------->

  11. Which mitosis phase requires the most time? Which mitosis phase requires the least time?How can we know? Why does it matter?

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