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Presentation on theme: "mKWxeMMFTEU-http://www.youtube.com/watch?v= mKWxeMMFTEU- 11 minutes process with music."— Presentation transcript:

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

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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? 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

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21 INDEPENDENT ASSORTMENT

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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

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26 Meiosis II

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31 Another Animation of Overall Meiosis

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


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