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Slide 2 http://www.youtube.com/watch?v= mKWxeMMFTEU-http://www.youtube.com/watch?v= mKWxeMMFTEU- 11 minutes process with music Slide 3 Slide 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 Slide 5 Meiosis Definition: cell division to produce egg (ovule) or sperm (pollen) Meiosis I & Meiosis II Slide 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 Slide 7 Homologous Chromosomes: matching pair of chromosomes, one inherited from each parent Slide 8 Diploidor 2N: having two sets of chromosomes, body cells Humans 46 chromosomes Haploidor N: having one set of chromosomes, sex cells ( gametes) Humans 23 chromosomes Slide 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 horses 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 Slide 10 Fertilization: when haploid sperm and egg meet, combining N chromosomes with N chromosomes = 2N zygote Zygote: fertilized egg, 2N ____ Slide 11 Oogenesis: Production of Egg Female meiosis in the ovaries Resulting cells: 1 egg, 3 polar bodies Haploid Slide 12 Spermatogenesis : Production of Sperm Male meiosis in testes Resulting cells: 4 haploid sperm cells Slide 13 Slide 14 Slide 15 Slide 16 Slide 17 Slide 18 Slide 19 Slide 20 Slide 21 INDEPENDENT ASSORTMENT Slide 22 Slide 23 CELL THEN GOES THROUGH cytokinesis - NO INTERPHASE NO MORE DOUBLING OF CHROMOSOMES!! Slide 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 Slide 25 Slide 26 Meiosis II Slide 27 Slide 28 Slide 29 Slide 30 Slide 31 Another Animation of Overall Meiosis Slide 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