1. Cell Reproduction Meiosis Notes

2. Why does meiosis occur?

3. How does meiosis occur? Meiosis Two Nucleus Prophase Metaphase Anaphase Telophase DNA Interphase

4. Meiosis is divided into two division Meiosis I –Prophase I –Metaphase I –Anaphase I –Telophase I Meiosis II –Prophase II –Metaphase II –Anaphase II –Telophase II

5. Prophase I Chromatin Nuclear envelope Homologous Cross over

6. One Chromosome and it’s Copy

7. MOMDAD Homologous Chromosomes: paired chromosomes with genes for the same traits

9. Prophase I Chromosomes Nuclear envelope Homologous Cross over

12. Metaphase I Spindle Equator

14. Anaphase I Separate Spindle Fibers

16. Telophase I Cytoplasm (cytokinesis)

17. End of 1 st Division Result: 2 diploid cells each with 46 chromosomes

19. Prophase II Spindle chromosomes

21. Metaphase II Chromosomes Equator

23. Anaphase II centromeres

25. Telophase II Nuclear envelope Spindle Cell Cytokinesis Four Haploid

27. End of 2 nd Division Result: 4 haploid cells each with 23 chromosomes

29. Comparing Mitosis and Meiosis

30. MITOSISMEIOSIS Number of Divisions Number of Daughter Cells Genetically Identical? Chromosome # Where When Role

31. MITOSISMEIOSIS Number of Divisions1 2 Number of Daughter Cells Genetically Identical? Chromosome # Where When Role

32. MITOSISMEIOSIS Number of Divisions1 2 Number of Daughter Cells2 4 Genetically Identical? Chromosome # Where When Role

33. MITOSISMEIOSIS Number of Divisions1 2 Number of Daughter Cells2 4 Genetically Identical?Yes No Chromosome # Where When Role

34. MITOSISMEIOSIS Number of Divisions1 2 Number of Daughter Cells2 4 Genetically Identical?Yes No Chromosome #46 23 Where When Role

35. MITOSISMEIOSIS Number of Divisions1 2 Number of Daughter Cells2 4 Genetically Identical?Yes No Chromosome #46 23 Where Somatic (body) Cells Gametes (Sperm and Egg) When Role

36. MITOSISMEIOSIS Number of Divisions1 2 Number of Daughter Cells2 4 Genetically Identical?Yes No Chromosome #46 23 Where Somatic (body) Cells Gametes (Sperm and Egg) When Making new body cells Making reproductive cells Role

37. MITOSISMEIOSIS Number of Divisions1 2 Number of Daughter Cells2 4 Genetically Identical?Yes No Chromosome #46 23 Where Somatic (body) Cells Gametes (Sperm and Egg) When Making new body cells Making reproductive cells RoleGrowth and repair Reproduction

38. MITOSISMEIOSIS Occurs in ________ (body) cells Occurs only in ________ (sex organs:______/______) Produces cells for______, maintenance, ______, asexual reproduction) Only produces_______________ (sex cells:______/______) Results in _____ diploid (2n) daughter cells Reduction division results in _____________ (n) cells

39. MITOSISMEIOSIS Occurs in somatic (body) cells Occurs only in gametes (sex organs: testes/ovaries) Produces cells for______, maintenance, ______, asexual reproduction) Only produces_______________ (sex cells:______/______) Results in _____ diploid (2n) daughter cells Reduction division results in _____________ (n) cells

40. MITOSISMEIOSIS Occurs in somatic (body) cells Occurs only in reproductive organs (sex organs: testes/ovaries) Produces cells for growth, maintenance, repair, asexual reproduction) Only produces gametes (sex cells: sperm/egg) Results in _____ diploid (2n) daughter cells Reduction division results in _____________ (n) cells

41. MITOSISMEIOSIS Occurs in somatic (body) cells Occurs only in reproductive organs (sex organs: testes/ovaries) Produces cells for growth, maintenance, repair, asexual reproduction) Only produces gametes (sex cells: sperm/egg) Results in TWO diploid (2n) daughter cells Reduction division results in FOUR haploid (n) cells