Download - 11 minutes process with music
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http://www.youtube.com/watch?v=mKWxeMMFTEU- 11 minutes process with music
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Mitosis- Cell division• 46 chromo2 cells, 46 chromo. Each• Keeps chromo. # same• Found in body cells• Most common• No genetic variation
Meiosis- Cell division• 46 chromo 4 cells, 23 chromo each• Chromo. # cut in half• Found in sex/germ cells
ONLY• Least common• 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 IIand Cytokinesis serve to separate the sisterchromatids- 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/bio17.swf::Comparison%20of%20Meiosis%20and%20Mitosis