Meiosis

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Author:
rileyrichardson
ID:
186192
Filename:
Meiosis
Updated:
2012-11-29 22:39:19
Tags:
AP Bio Meiosis
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  1. Meiosis
    • A single replication of chromosomes with 2 cell divisions. 
    • Reluslts in 4 daughter cells with haploid (N) chromosome #
  2. Meiosis I
    Prophase I, Metaphase I, Anaphase I, Telophase I
  3. Meiosis II
    • No DNA replication
    • Prophase II, Metaphase II, Anaphse II, Telophase II
  4. Prophase I
    • Longer and more complex than mitosis
    • Chromosomes condense & attach to Nuclear membrane- Bivalents form. 
    • synapsis occurs- tetrad forms
    • Crossing over occurs at chiasmata (one to several places)
    • Genetic Recombination
  5. Genetic Recombination
    • Mix DNA from nonsister chromatids
  6. Metaphase I
    • Bivalents line up on the equator
  7. Anaphase I
    • Homologous split-sister chromatids stay attached.
    • Reduces chromosome # to haploid

  8. Telophase I
    • Haploid set of chromosomes at each pole 
    • Cytokinesis occurs
  9. Meiosis II 
    No DNA replication
  10. Prophase II
    Spindles more chromosomes to equator
  11. Metaphase II
    • Line up on equator
  12. Anaphase II
    • Sister chromatids seperate & move to poles
  13. Telophase II
    • Nuclei form around 4 haploid daughter cells
  14. Interphase I
    • Chromosome replicates and has same structures as mitosis
  15. Mitosis
    • 2 daughter cells
    • Maintains same chromosome #
    • No genetic recombination
  16. Meiosis
    • 4 daughter cells 
    • Reduces to haploid from diploid chromosome #
    • Genetic recombination occurs

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