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Introduction to Mitosis and Meiosis

Unit III Meiosis and Fertilization. Introduction to Mitosis and Meiosis . Biology is the only subject in which multiplication is the same thing as division …. MITOSIS: Making New Cells Making New DNA. Where it all began….

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Introduction to Mitosis and Meiosis

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  1. Unit III Meiosis and Fertilization Introduction to Mitosis and Meiosis

  2. Biology is the only subject in which multiplication is the same thing as division…

  3. MITOSIS:Making New CellsMaking New DNA

  4. Where it all began… You started as a cell smaller than a period at the end of a sentence…

  5. And now look at you… How did you get from there to here?

  6. Getting from there to here… • Going from egg to baby…. the original fertilized egg has to divide… and divide… and divide… and divide…

  7. Why do cells divide… • One-celled organisms • for reproduction • asexual reproduction(clones) • Multi-celled organisms • for growth & development • fromfertilized eggto adult • for repair & replacement • replace cells that die from normal wear & tear or from injury amoeba starfish

  8. Dividing cells… • What has to be copied • DNA • organelles • cell membrane • lots of othermolecules • enzymes plant cell animal cell

  9. double-strandedhuman chromosomes ready for mitosis

  10. Chromosomes of Human Female 46 chromosomes 23 pairs

  11. Chromosomes of Human Male 46 chromosomes 23 pairs

  12. THINK-PAIR-SHARE • THINK ( 3 minutes)-> write 5 things • PAIR ( 2 minutes )-> share 2 things with your partner write what your partner said • SHARE ( 2 minutes)-> share 1 thing with the class write what the class shared

  13. I.P.M.A.T.C. STEPS OF MITOSIS i p C M A T

  14. Mitosis: Dividing DNA & cells • Stage 1: cell copies DNA Copy DNA! DNA cell nucleus (interphase)

  15. Mitosis: Dividing DNA & cells • Stage 2: DNA winds into chromosomes • DNA is wound up into chromosomes to keep it organized duplicated chromosomes Wind up! cell nucleus (prophase)

  16. Mitosis: Dividing DNA & cells • Stage 3: Chromosomes line up • chromosomes line up in middle • attached to protein “cables” that will help them move Line up! duplicated chromosomes lined up in middle of cell (metaphase)

  17. Mitosis: Dividing DNA & cells • Stage 4: Chromosomes separate • chromosomes split, separating pairs • start moving to opposite ends Separate! chromosomes split & move to opposite ends (anaphase)

  18. Mitosis: Dividing DNA & cells • Stage 5: Cell starts to divide • cells start to divide • nucleus forms again Divide! (telophase)

  19. Mitosis: Dividing DNA & cells • Stage 6: DNA unwinds again • cells separate • now they can do their every day jobs Bye Bye! (cytokinesis)

  20. New “daughter” cells • Get 2 exact copies of original cells • same DNA • “clones”

  21. Cell division in Animals

  22. Mitosis in whitefish embryo

  23. Mitosis in plant cell

  24. onion root tip

  25. I.P.M.A.T.C. Overview of mitosis interphase prophase PleaseMake Another Two Cells cytokinesis metaphase anaphase telophase

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