Objectives : Identify steps of cell cycle - PowerPoint PPT Presentation

objectives identify steps of cell cycle n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Objectives : Identify steps of cell cycle PowerPoint Presentation
Download Presentation
Objectives : Identify steps of cell cycle

play fullscreen
1 / 84
Objectives : Identify steps of cell cycle
123 Views
Download Presentation
wynn
Download Presentation

Objectives : Identify steps of cell cycle

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Objectives: Identify steps of cell cycle Catalyst: Make a T-chart for prokaryotic and eukaryotic cells.

  2. TODAY • I Present – you take down info • Let’s Practice Together • Two quick Practice Sheets • Utilizing selector tool • Then you prove your knowledge!!!!! • Whiteboards • Flipbook

  3. How many cells do we begin with?

  4. 1

  5. How do we get more? • A: Go to Wal-Mart • B: Email Mr. Land • C: Cellular Division

  6. CELL DIVISION process by which cells reproduce themselves

  7. Cell Cycle • The time it takes a cell to reproduce varies depending on cell type

  8. CELLS & George Wythe • Why would a cell divide? • Why is the school divided by grade levels? • How do cells get water and energy? • Why must we have multiple lunch shifts?

  9. MITOSIS All cells except sex cellsproduces cells with the exact same DNA and characteristics

  10. Binary Fission • Bacteria replicate its chromosomes and then divides in two • Budding • Little buds sprout from parent and then grow up – same chromosomes • Sporulation • Fungi produces spores that are released into the air – same chromosomes

  11. CELL CYCLE 2 Stages Cell Division Interphase Interphase Cell Division

  12. INTERPHASE

  13. G1 PHASE • “gap 1” Phase • period when cell growth and development occur

  14. S PHASE • “synthesis” Phase • DNA replication / synthesis occurs

  15. G2 PHASE • “gap 2” Phase • when organelles needed in cell division are made (centrioles, spindle fibers)

  16. CELL CYCLE 2 Stages Cell Division Interphase Interphase Cell Division

  17. CELL Division is composed of 2 separate stages M Phase (Mitosis) Cell Division Cytokinesis (division of cytoplasm) Back to Interphase

  18. MNEMONIC DEVICE!!! REMEMBER!! • What happens if Mr. Gibney drinks 4 bottles of gatorade and chills on the couch for an hour. • He gets up and goes to the bathroom and is in such a hurry that he kinda misses. • PMAT

  19. PROPHASEMETAPHASEANOPHASETELOPHASE

  20. 1. PROPHASE • longest phase • Chromosomes appear & attach to spindle • Nucleolus and nuclear membrane breaks down

  21. 2. METAPHASE • Shortest phase • Chromosomes line up at center of the cell

  22. 3. ANAPHASE • Centromeres split • Chromosomes separate to become individuals • Ends when the movement of chromosomes stops

  23. 4. TELOPHASE • Chromosomes uncoil into chromatin • Nuclear membrane reforms • Spindle breaks apart

  24. CYTOKINESIS Division of the cytoplasm of the cell

  25. Meiosis • Humans have 23 pairs of chromosomes for a total of 46 chromosomes • Chromosomes exist in pairs called homologues • Diploid cells have two sets of chromosomes – Ex: all cells (skin, hair, eye) except for sex cells • Haploid cells have one half the chromosomes – Ex: only sex cells

  26. Sex cells are also called gametes • Meiosis is the process by which sex cells make sure they have the right number of chromosomes • Meiosis takes place in the gonads: testes and ovaries

  27. Sex Chromosomes Women: Men: Many women ask why oh “y” XX Xy

  28. Haploid or Diploid Haploid!! Haploid!! Diploid!!

  29. Meiosis The process of cell division so that each new cell has 1/2 the number of chromosomes as the original.

  30. Cell Divides Once Results in 2 cells with 46 Chromosomes MITOSIS MEIOSIS • Cell Divides Twice • Results in cells with 23 Chromosomes • Makes 4 sperm cells or 1 egg cell

  31. Stages of Meiosis • The stages of Meiosis in order are: Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II, and Telophase II • Spermatogenesis – makes four sperm cells from each parent cell • Oogenesis – makes one ovum and three polar bodies from each parent cell (polar bodies are discarded)

  32. PRACTICE!!!!! • I’ve Presented – you’ve taken down info • Let’s Practice Together • Two quick Practice Sheets • Utilizing selector tool • Then you prove your knowledge!!!!! • Whiteboards • Flipbook

  33. WHITEBOARD PRACTICE • POD Group Competitions

  34. G1 PHASE • This is the period when cell growth and development occur

  35. CELL CYCLE 2 Stages ? Interphase ? Cell Division

  36. S PHASE • DNA replication / synthesis occurs • Part of interphase

  37. 1. PROPHASE • longest phase • Chromosomes appear & attach to spindle • Nucleolus and nuclear membrane breaks down

  38. G2 PHASE • when organelles needed in cell division are made (centrioles, spindle fibers)

  39. 3. ANAPHASE • Centromeres split • Chromosomes separate to become individuals • Ends when the movement of chromosomes stops

  40. CELL Division is composed of 2 separate stages Cell Division Back to Interphase

  41. 2. METAPHASE • Shortest phase • Chromosomes line up at center of the cell

  42. CYTOKINESIS Division of the cytoplasm of the cell

  43. 4. TELOPHASE • Chromosomes uncoil into chromatin • Nuclear membrane reforms • Spindle breaks apart