1 / 23

Asexual Reproduction aka MITOSIS!

Asexual Reproduction aka MITOSIS!. In asexual reproduction, cell division results in 2 identical “ daughter ” cells being produced from a “parent” parent cell Each human cell has 46 chromosomes in its nucleus. Cell Cycle - Mitosis. 10% of cell life cycle The cell undergoes cell division.

ebony
Download Presentation

Asexual Reproduction aka MITOSIS!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Asexual Reproduction aka MITOSIS! • In asexual reproduction, cell division results in 2 identical “daughter” cells being produced from a “parent” parent cell • Each human cell has 46 chromosomes in its nucleus

  2. Cell Cycle - Mitosis • 10% of cell life cycle • The cell undergoes cell division In humans, millions of cells divide every second to maintain a total of ~60 trillion cells - some divide once a day (skin & hair), others less often (stomach lining) and some not at all (nerve & muscle cells)

  3. Stages of Mitosis Mitosis is a continual process, but we divide it into 4 phases Mitosis phases: • Prophase • Metaphase • Anaphase • Telophase

  4. Mitosis 1. Prophase • chromatin condenses into distinct duplicated chromosomes • Nuclear membrane begins to disintegrate • In animal cells organelles called the centrioles move to opposite sides of the cell (“poles”) • Astral rays (microtubles) form around centrioles

  5. Be sure to label: • Sister chromatids/ chromosomes • Centrioles • Astral rays • Nuclear memebrane Draw a prophase diagram Centrioles Astral Rays Made of 2 sister chromatids, attached by a centromere Nuclear membrane disintegrates

  6. Early Prophase

  7. Late Prophase

  8. Mitosis Step 2: Metaphase • Chromosomes line up at equatorial plate and centromere attaches to spindle fibers that formed from elongated astral rays • At the end of this phase the centromere splits separating the sister chromatids • Nuclear membrane disappears

  9. Draw a diagram • Be sure to label: • Centromere • Equatorial plate • Spindle fibers • Centriole Spindle Fibres Centrioles Centromere Equatorial Plate

  10. METAPHASE

  11. Metaphase: Spindle Fibers

  12. Mitosis Step 3: Anaphase • The spindle fibers contract, pulling the chromosomes (sister chromatids) to the opposite poles of the cell • Centromeres divide

  13. Draw a diagram • Be sure to include: • Sister chromatids • Spindle fibres • Centromere • Centrioles Centrioles Centromere is split

  14. ANAPHASE

  15. Mitosis Step 4: Telophase • Chromatids reach opposite poles; spindle and astral rays disappear • Chromosomes unwind back into chromatin • Nuclear membrane begins to reform • Cell membrane pinches in the middle to divide the cell = Cytokinesis

  16. Cytokinesis • Cytoplasm begins to divide by forming a cleavage furrow at the equator and pinches off • Forming 2 daughter cells, with genetic information identical to each other • These cells will become the new parent cells • Cytokinesis in an animal cell Cleavage furrow

  17. Draw a diagram • Be sure to liable: Part A: • Cleavage furrow • Nuclear membrane Part B: • Daughter cells • Nuclear membrane • Chromatin Daughter cells Chromatin Nuclear membrane

  18. TELOPHASE

  19. INTERPHASE PROPHASE

  20. METAPHASE ANAPHASE TELOPHASE & CYTOKINESIS Metaphase plate Cleavagefurrow Nucleolusforming Nuclearenvelopeforming Daughterchromosomes Spindle

  21. Metaphase Interphase Prophase Metaphase Anaphase Telophase

  22. Animals Versus Plants • There are 2 main differences in plant cell division • Plants do not contain centrioles • They contain microtubules that create many of the same proteins (spindles), they just don’t have the centrioles 2. Plants do not undergo cytokinesis - Instead a cell plate forms at the equator of the cell to form a new cell wall

  23. Cytokinesis • Animal Cytokinesis Plant Cytokinesis Cleavage furrow Cell Plate

More Related