2. Four Mitotic Stages
3. Prophase 4. Steps in Prophase
- DNA coils tightly & becomes visible as chromosomes
5. Prophase continued
- 2. Membrane around nucleus disappears
- 4. Centrioles migrate to poles
- 5. Spindle begins to form
- * the job of the spindle is to attach to the middle of each
chromosome and pull the chromatids apart
- * (see next slide for image of spindle)
6. Mitotic Spindle 7. Eukaryotic Chromosome At the point in the
center of the chromosome, labeled kinetochore, fibers attach in
order to pull the two halves apart. 8. 9. Human Chromosomes 10.
Steps in Metaphase
- Spindle fibers from centrioles attach to each chromosome
- Cell preparing to separate its chromosomes
- Cell aligns its chromosomes in the middle of the cell
11. Metaphase Chromosomes lined up at the equator Asters at the
poles Spindle Fibers 12. Metaphase 13. Steps in Anaphase
- Cell chromosomes are separated
- Spindle fibers shorten so chromosomes pulled to ends of
cell
14. Anaphase 15. Anaphase Sister chromatids being separated 16.
Steps in Telophase
- Separation of chromosomes completed
- Cell Plate forms (plants)
- Cleavage furrow forms (animals)
- Nucleus & nucleolus reform
17. Telophase Plant Animal 18. Cytokinesis
- Means division of cytoplasm and all organelles within
- Occurs after chromosomes separate
- Forms two, identical daughter cells
19. Cytokinesis Cell Plate Forming in Plant Cells 20.
Cytokinesis Cleavage furrow in animal cell Cell plate in animal
cell 21. Stages of M phase of cell cycle 22. Put the following in
the correct order: