Onion Root Tip Lab - PowerPoint PPT Presentation

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Onion Root Tip Lab

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  1. Onion Root Tip Lab Rachel Hildreth Shanna Rentz

  2. 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 -------------------------------------->

  3. 4 Phases of Mitosis • Prophase • Metaphase • Anaphase • Telophase/Cytokinesis (sometimes referred to 5th)

  4. Interphase (Pre-Mitosis) Cell prepares for division by: • replicating DNA and organelles • increasing cell size

  5. Prophase Cell prepares for nuclear division by: • condensing DNA into movable packages called chromosomes

  6. Metaphase Cell prepares chromosomes for division by: • aligning chromosomes at cell equator • attaching spindle fibers from each new daughter cell pole to each chromosome at the centromere

  7. Anaphase Chromosomes divide: • spindle fibers pull chromosomes apart • one-half of each chromosome (chromatid) moves to a new daughter cell

  8. Telophase/Cytokinesis Cytoplasm divides: • DNA decondenses and two nuclei form • new cell wall (cell plate) appears between the two nuclei to form two new daughter cells

  9. Onion Root Tip Mitosis