Meiosis and Binary Fission

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					Meiosis and Binary Fission
                   Binary Fission
• Binary Fission: Cell division in prokaryotes,
  that copy their DNA, a membrane forms
  around it and two new cells are formed.
• In prokaryotes, cell division is less difficult for
  the cell
   – Less complex, specially with bacteria with one cell,
     and the DNA is Circular!
      • Also, Their DNA is less complex, so cell division is less
        complicated.
• Binary Fission is not Mitosis!!
                     Meiosis
• Meiosis: The division of Diploid cells into
  Haploid cells
  – This is crucial for gamete cells in eukaryotes.
     • What are gametes?
  – The reason why, is because it starts out to be
    diploid.
                        Meiosis
• Meiosis is extremely important because it creates
  genetic diversity within species.
  – Mitosis creates identical cells
     • These are body cells
  – Meiosis creates genetically different cells
     • These are sex chromosomes.
• Meiosis goes through the same steps as Mitosis
  but it repeats itself.
  – And it has two different types of chromosomes.
     • One from father and the other from mother.
             Steps of Mieosis
• 8 steps!
  – Prophase I
  – Metaphase I
  – Anaphase I
  – Telophase I
  – Prophase II
  – Metaphase II
  – Anaphase II
  – Telophase II
             Steps Of Meiosis
• Each stage is the same as Mitosis except that
  you have two sets of chromosomes!




• And it repeats itself until it has four haploid
  cells!
                   Meiosis
• During Prophase I, The chromosome will
  sometimes Crossover.
  – Crossover- is when Chromotids from a
    chromosome will break off and switch
    Chromosomes.
                    Meiosis
• They also form Oogensis
  – Formation of egg cells
• It also forms Sperm cells through the process
  of Spermatogensis.

				
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posted:7/18/2012
language:English
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