Meiosis

• Meiosis


  a type of cell division that happens when an organism is ready to produce gametes through gametogenesis.
• Meiosis produces...


  4 genetically different haploid cells from 1 diploid cells
• gametes


  sperm or egg cell
• Meiosis I - 2 genetically different haploid cells

  1. prophase I
  2. metaphase I
  3. Anaphase I
  4. Telophase I
• Meiosis II

  1. Prophase II
  2. Metaphase II
  3. Anaphase II
  4. Telophase II
• In prophase I...

  • synapsis: homologues chromosomes pair up
  • recombination: switching of portions between two chromosomes from each parent
• In metaphase I...

  • spindle fibers connect to one chromosome from each pair
• In prophase II...

  • no DNA replication happens
• identify stages of meiosis I

  A) Anaphase I

  B) prophase I

  C) telophase I

  D) Metaphase I

  
• identify stages of Meiosis II

  A) Prophase II

  B) Telophase II

  C) Anaphase II

  D) Metaphase II

  
• why will no one ever look the same as you?

  synapsis, recombination, random fertilization