1 / 18

Read p.125 Rain Forest Rescue and 8.1, 8.2, 8.4, 8.5, 8.6

Read p.125 Rain Forest Rescue and 8.1, 8.2, 8.4, 8.5, 8.6. Asexual and Sexual Reproduction. Cell Mitosis Lesson Objectives ∙We will understand the importance of cell reproduction (mitosis). ∙We will learn about all the stages of mitosis. Why Mitosis?.

quentin-hahn
Download Presentation

Read p.125 Rain Forest Rescue and 8.1, 8.2, 8.4, 8.5, 8.6

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. Read p.125 Rain Forest Rescue and 8.1, 8.2, 8.4, 8.5, 8.6

  2. Asexual and Sexual Reproduction

  3. Cell Mitosis Lesson Objectives • ∙We will understand the importance of • cell reproduction (mitosis). ∙We will learn about all the stages of • mitosis.

  4. Why Mitosis? • Growth. The number of cells within an organism increases by mitosis and this is the way multicellular organisms grow. ∙ • Cell Replacement. Cells are constantly dying and being replaced by new ones. The new cells must be exact copies of the cells being replaced. ∙ • Regeneration. Some animals can regenerate parts of their body, and production of new cells are achieved by mitosis. • Red blood cells have short live spans of about 4 months and need to be replaced constantly by mitosis.

  5. 8.4 chromosomes Draw figure 8.4b and 8.4c Do question p. 128

  6. Eukaryotes vs Prokaryotes—BODY CELLS (somatic cells) Human cells (eukaryotes) have 25,000 genes Bacterium (prokaryotes) have 3,000 genes Chromatin—chromosome material, diffused mass of DNA and protein molecules. Long thin fibers Found in Interphase of Cell cycle

  7. Chromatin to chromosomes During interphase chromatin doubles its material—information for 46 chromosomes in humans, duplicates material for 92 chromosomes As chromatin coils up (prophase) Sister chromatids (two identical copies) are formed--figure 8.4b Centromere—connection between sister chromatids

  8. Daughter cells Fuzzy appearance—intricate twists and folds of chromatin fibers P130 Create table comparing/contrasting stages of mitosis Leave out prometaphase, include interphase and cytokenesis

  9. CELL CYCLE P.129

  10. Interphase

  11. Mitosis begins-Prophase(cell begins to divide)

  12. Chromatids (or pairs of chromosomes) • attach to the spindle fibers

  13. Chromatids (or pairs of chromosomes) • separate and begin to move to opposite ends of • the cell. • Title: Mar 25 8: • 52 PM (6 of 9)

  14. Two new nuclei form, one for each cell. ∙Chromosomes appear as chromatin. ∙Mitosis ends. • Title: Mar 25 8: • 53 PM (7 of 9)

  15. The cell membrane moves inward to create two • daughter cellseach • with its own nucleus with • identical chromosomes.

  16. ∙ Interphase ∙The Chromosomes are copied • (# doubles). • ∙ Prophase ∙The nuclear membrane disappears. • ∙ Metaphase ∙Chromatids (or pairs of • chromosomes) attach to the spindle • fiber. ∙ Anaphase ∙Chromatids (or pairs of chromosomes) • separate and begin to move to opposite • ends of the cell. • ∙ Telaphase ∙Two new nuclei form, one for each cell. • ∙ Cytokinesis ∙The cell membrane moves inward to create • two daughter cellseach • with itso wn nucleus • with identical chromosomes. • Title: Apr 6 6: • 47 PM (9 of 9)

More Related