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Published byEricka Voiles Modified over 10 years ago
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http://www.youtube.com/watch?v= mKWxeMMFTEU-http://www.youtube.com/watch?v= mKWxeMMFTEU- 11 minutes process with music
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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
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Meiosis Definition: cell division to produce egg (ovule) or sperm (pollen) Meiosis I & Meiosis II
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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
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Homologous Chromosomes: matching pair of chromosomes, one inherited from each parent
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“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
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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
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Fertilization: when haploid sperm and egg meet, combining N chromosomes with N chromosomes = 2N zygote Zygote: fertilized egg, 2N ____
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Oogenesis: Production of Egg Female meiosis in the ovaries Resulting cells: 1 egg, 3 polar bodies Haploid
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Spermatogenesis : Production of Sperm Male meiosis in testes Resulting cells: 4 haploid sperm cells
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INDEPENDENT ASSORTMENT
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CELL THEN GOES THROUGH cytokinesis ”- NO INTERPHASE NO MORE DOUBLING OF CHROMOSOMES!!
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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
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Meiosis II
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Another Animation of Overall Meiosis
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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
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