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The Importance of Mitosis

The Importance of Mitosis. The need to heal!. The need to grow!. DNA. Made of nucleotides Phosphate sugar Nitrogen base Adenine Guanine Cytosine thymine. Coiling. Uncoiled DNA called chromatin- between cell divisions Happens during cell division

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The Importance of Mitosis

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  1. The Importance of Mitosis

  2. The need to heal!

  3. The need to grow!

  4. DNA • Made of nucleotides • Phosphate • sugar • Nitrogen base • Adenine • Guanine • Cytosine • thymine

  5. Coiling • Uncoiled DNA called chromatin- between cell divisions • Happens during cell division • DNA wraps tightly around proteins called histones

  6. Chromosomes • Chromosome- consists of two identical halves connected together by a cnetromere • Chromatid- a half of one chromosome. • Contains one complete set of information • Copies itself to make the other chromatid

  7. How many chromosomes?? • Each human diploid cell is 2N and contains 46 total • 23 identical pairs ( 23 x 2 = 46 ) “homologous chromosomes” carry the same traits

  8. How many chromosomes?? • Egg and sperm cells only carry one set of 23 • Each human haploid cell is “N” • Egg and sperm combine to form 2N or 46 • All other chromosomes are called autosomes • Each human or animal cell has sex chromosomes XX or XY • Define the sex of the organism

  9. Cell Cycle • G1 = cell grows • S = DNA replication • G2= Prepare to divide • M= Mitosis INTERPHASE

  10. 2-4-8-16, etc… Quicktime video

  11. Stages of Mitosis • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis

  12. Birth of a Brain Cell • Quicktime movie

  13. Stages of mitosis id: slide #1

  14. 2 and 3

  15. 4 and 5

  16. 6 and 7

  17. 8 and 9

  18. 10, 11, 12

  19. 13, 14, 15

  20. 16, 17, 18

  21. YOUR QUIZ ON MITOSIS IS TOM. • Here’s what you need to be able to do…

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