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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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Presentation Transcript
slide4
DNA
  • Made of nucleotides
    • Phosphate
    • sugar
    • Nitrogen base
        • Adenine
        • Guanine
        • Cytosine
        • thymine
coiling
Coiling
  • Uncoiled DNA called chromatin- between cell divisions
  • Happens during cell division
  • DNA wraps tightly around proteins called histones
chromosomes
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
how many chromosomes
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

how many chromosomes8
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
cell cycle
Cell Cycle
  • G1 = cell grows
  • S = DNA replication
  • G2= Prepare to divide
  • M= Mitosis

INTERPHASE

2 4 8 16 etc
2-4-8-16, etc…

Quicktime video

stages of mitosis
Stages of Mitosis
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
  • Cytokinesis
birth of a brain cell
Birth of a Brain Cell
  • Quicktime movie
slide21
YOUR QUIZ ON MITOSIS IS TOM.
  • Here’s what you need to be able to do…