1 / 26

Cell Cycle

Cell Cycle. The cell cycle begins when the cell is formed and ends when the cell divides and forms new cells. DNA. Before a cell divides, DNA is copied DNA is organized into structures called chromosomes DNA is in the nucleus. Cell Cycle ( Prokaryotic ) BACTERIA.

arav
Télécharger la présentation

Cell Cycle

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. Cell Cycle The cell cycle begins when the cell is formed and ends when the cell divides and forms new cells.

  2. DNA • Before a cell divides, DNA is copied • DNA is organized into structures called chromosomes • DNA is in the nucleus

  3. Cell Cycle (Prokaryotic) BACTERIA • Bacteria are not complex • Bacteria contain ribosomes and a single circular molecule of DNA • Bacteria have no membrane bound organelles, making cell division simple • Cell division is called binary fission- splitting into two parts • They make a copy of the DNA and split with each cell containing a copy

  4. Binary Fission in Bacteria • Bacteria

  5. Binary Fission • Bacteria

  6. Eukaryotic Cell DivisionCHROMOSOMES • Chromosomes contain lots of DNA and proteins • Number of chromosomes is different in each organism-humans=46, potatoes=48, and fruit flies=8 • Chromosomes can line up in pairs containing similar information (homologous chromosomes)

  7. CHROMOSOMES

  8. Making More Eukaryotic CellsINTERPHASE STAGE 1 • Three stages, Interphase, Mitosis, and Cytokinesis • Stage 1(INTERPHASE)=Cell grows and copies organelles, centriole, and chromosomes • Strands of DNA and proteins are like loosely coiled thread • After chromosomes are duplicated, the copies are now called chromatids • Chromatids are held together by a centromere

  9. INTERPHASE

  10. INTERPHASE

  11. Making More Eukaryotic Cells MITOSIS STAGE 2 • Three stages, Interphase, Mitosis, and Cytokinesis • Stage 2 (Mitosis)Chromosome Separation • 4 Phases OF MITOSIS = Prophase, Metaphase, Anaphase, and Telophase

  12. Mitosis STAGE 2Separation – PHASE1 • Phase 1(Prophase) Mitosis begins • Nuclear membranes break apart • Chromosomes condense into rod like structures • Two pair of centrioles move to opposite sides of the cell • Fibers form between the centrioles and attach to the centromeres

  13. MITOSIS – STAGE 2PHASE 1 PROPHASE

  14. MORE PROPHASE

  15. Mitosis STAGE 2Separation – PHASE 2 • Phase 2 (Metaphase) • Chromosomes line up along the equator of the cell • Remember M for Middle

  16. METAPHASE

  17. MORE METAPHASE

  18. Mitosis – STAGE 2Separation – PHASE 3 • Phase 3 (Anaphase) • Chromatids separate and are pulled to opposite sides of the cell by fibers that are attached to the centrioles • Remember A for Apart

  19. ANAPHASE

  20. ANAPHASE

  21. Mitosis – STAGE 2Separation – PHASE 4 • Phase 4 (Telophase) • Nuclear membrane forms around two sets of chromosomes and they unwind • Fibers disappear • Mitosis is completed • Remember T for Two • The kindergarten teacher said “Do not p on the mat! (PMAT)

  22. TELOPHASE

  23. Stage 3 CYTOKINESIS-Animal Cell • After mitosis, the cytoplasm splits in two, (Cytokinesis) • Result is two identical cells, identical to the original cell they came from • After cytokinesis, cell cycle is complete and will start over again

  24. Stage 3 CYTOKINESIS-Plant Cell • When plant cells divide, a cell plate forms and the cell is split in two • Cell plate becomes the new cellmembrane that will separate the two cells • After split, new cell wall forms

  25. CYTOKINESIS

  26. CELL CYCLE COMPLETE!

More Related