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Cell Reproduction Part 1

“All cells come from pre-existing cells.”. Cell Reproduction Part 1. Show and Quiz Extravaganza!. Cells Multiply By Dividing!. Cells must divide for. Growth Repair Reproduction. The Star of Our Show. Prior to division, chromosomes are duplicated.

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Cell Reproduction Part 1

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  1. “All cells come from pre-existing cells.” Cell Reproduction Part 1 Show and Quiz Extravaganza!

  2. Cells Multiply By Dividing!

  3. Cells must divide for... • Growth • Repair • Reproduction

  4. The Star of Our Show

  5. Prior to division, chromosomes are duplicated. • A single stranded chromosome becomes a double stranded chromosome. • The two strands are IDENTICAL

  6. The identical strands are called sister chromatids. • They are held together by a centromere. centromere chromatids

  7. The Cell Cycle

  8. The Cell Cycle • The life of a eukaryotic cell is traditionally shown as a cycle.

  9. Cell Cycle Summary • G1 – Cell growth phase • S – New DNA is synthesized • G2 – Preparation for cell division • M & C - Cell division

  10. Cell Division Includes:

  11. Mitosis • Division of the nucleus to form two new nuclei with the same number and type of chromosomes as the parent cell.

  12. Cytokinesis • The division of the cytoplasm to form two new cells.

  13. Before Mitosis • Interphase is the period between cell division. (G1, S & G2) • Cell growth. • Chromosomes duplicate. • Synthesis of organelles and materials needed for cell division.

  14. Now it’s Mitosis Time! Cells spend 90% of their lives during Interphase. So, once we get to Mitosis – it’s GO time!

  15. Prophase • Chromatin condenses into chromosomes. • The nuclear membrane disappears.

  16. Metaphase • Chromosomes line up across the equator, or center, of the cell.

  17. Anaphase • Sister chromatids are pulled to opposite sides of the cell & away from each other.

  18. Telophase • New nuclear membranes appear. • Cytokinesis begins. • Chromosomes uncoil.

  19. After Mitosis • Cells undergo Cytokinesis • The cytoplasm of the cell is divided in half • The cell membrane grows to enclose each cell • Results in TWO genetically IDENTICAL cells

  20. Animal Cell Cytokinesis • The cell membrane is pinched in half by a belt of protein threads

  21. Plant Cell Cytokinesis • A cell plate forms in the center of the dividing cell then fuses to make a new cell wall.

  22. Mitosis Quiz Fun!

  23. 1. Name That Phase!

  24. 2. Name That Phase!

  25. 3. Name That Phase!

  26. 4. Name That Phase!

  27. LABEL THIS! 5. What is A? A 6. What is B? B

  28. Question #7 • A human cell contains 46 chromosomes. • How many chromosomes will each of its daughter cells have following mitosis?

  29. Question #8 • __________ is the division of the nucleus to form two new nuclei with the same number and type of chromosomes as the parent cell.

  30. Question #9 • __________ is the division of the cytoplasm to form two new cells.

  31. Question #10 • Chromosomes must ____________ prior to mitosis. A. split in half B. duplicate C. dance around D. pass the AIMS test

  32. 1. Name That Phase! PROPHASE

  33. 2. Name That Phase! TELOPHASE

  34. 3. Name That Phase! METAPHASE

  35. 4. Name That Phase! ANAPHASE

  36. LABEL THIS! 5. What is A? A CENTROMERE 6. What is B? SISTER CHROMATIDS B

  37. Question #7 • A human cell contains 46 chromosomes. • How many chromosomes will each of its daughter cells have following mitosis? ANSWER: 46

  38. Question #8 MITOSIS • __________ is the division of the nucleus to form two new nuclei with the same number and type of chromosomes as the parent cell.

  39. Question #9 • __________ is the division of the cytoplasm to form two new cells. CYTOKINESIS

  40. Question #10 • Chromosomes must ____________ prior to mitosis. A. split in half B. duplicate C. dance around D. pass the AIMS test *

  41. B

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