2. http://www.youtube.com/watch?v= mKWxeMMFTEU-http://www.youtube.com/watch?v= mKWxeMMFTEU- 11 minutes process with music

4. Mitosis- Cell division 46 chromo  2 cells, 46 chromo  2 cells, 46 chromo. Each 46 chromo. Each Keeps chromo. # same Keeps chromo. # same Found in body cells Found in body cells Most common Most common No genetic variation No genetic variation Meiosis- Cell division 46 chromo  4 cells, 46 chromo  4 cells, 23 chromo each 23 chromo each Chromo. # cut in half Chromo. # cut in half Found in sex/germ cells ONLY Found in sex/germ cells ONLY Least common Least common Most genetic variation Most genetic variation ANIMATION OF COMPARISON ANIMATION 2 OF COMPARISON

5. Meiosis Definition: cell division to produce egg (ovule) or sperm (pollen) Meiosis I & Meiosis II

6. Karyotypes Display of chromosomes lined up in homologous pairs Half inherited from male Half from female Used for viewing #, size, shape, and banding patterns of chromosomes

7. Homologous Chromosomes: matching pair of chromosomes, one inherited from each parent

8. “Diploid”or 2N: having two sets of chromosomes, body cells Humans 46 chromosomes “Haploid”or N: having one set of chromosomes, sex cells ( gametes) Humans 23 chromosomes

9. Diploid vs. Haploid Exercises Drosophilia have a diploid number of 8. What is the haploid? Onions have a haploid number of 8. What is the 2N? A horse’s 2N is 64. What is the 1N? A body cell of an alligator has 32 chromosomes. Is this the diploid or haploid number? 4 16 32 Diploid

10. Fertilization: when haploid sperm and egg meet, combining N chromosomes with N chromosomes = 2N zygote Zygote: fertilized egg, 2N ____

11. Oogenesis: Production of Egg Female meiosis in the ovaries Resulting cells: 1 egg, 3 polar bodies Haploid

12. Spermatogenesis : Production of Sperm Male meiosis in testes Resulting cells: 4 haploid sperm cells

21. INDEPENDENT ASSORTMENT

23. CELL THEN GOES THROUGH cytokinesis ”- NO INTERPHASE NO MORE DOUBLING OF CHROMOSOMES!!

24. General Process of Meiosis MEIOSIS II (PMAT II & C) - Starts with 2 haploid cells - Prophase, Metaphase, Anaphase, Telophase II and Cytokinesis serve to separate the sister chromatids - Ending Cells: 4 cells, each with haploid chromosomes

26. Meiosis II

31. Another Animation of Overall Meiosis

32. McGraw Hill Animation http://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535 ::535::/sites/dl/free/0072437316/120074/bio 17.swf::Comparison%20of%20Meiosis%20and %20Mitosis