13 May 2010 Thursday

13 May 2010 Thursday - b. Centromeres do not divide 6....

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Lecture notes genetics 13 May 2010 Meiosis 1. Functions of meiosis: to produce gametes (sperm, eggs) and decrease chromosome number by one half Stages of meiosis: 2. Prophase I is divided into 5 stages, named for the appearance of the chromosomes under the light microscope. (Each stage is not really discrete, but they are given distinct names for the sake of convenience) a. Pairing of homologous chromosomes = synapse b. Crossing over – genetic recombination 3. Stages of prophase I a. Leptotene: chromosome condensation b. Sygotene: homologous chromosomes begin to pair with each other c. Pachytene: homologs are completely paired all along their lengths d. Diplotene: desynapsis begins e. Diakinesis: terminalization of chiasmata 4. Metaphase I a. Chromosomes line up along equator in pairs 5. Anaphase I a. Members of pairs of homologous chromosomes begin to move to opposite poles
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Unformatted text preview: b. Centromeres do not divide 6. Telophase I a. Nuclear membrane begins to reform b. Spindle apparatus disassembles c. Chromosomes begin to decondense 7. Important outcomes of meiosis I a. Reduced chromosome number by one half 8. Interkinesis a. Brief pause b. NO DNA synthesis c. NO chromosome replication 9. Prophase II a. Spindle apparatus reassembled b. Nuclear membrane disintegrates c. Chromosomes condense 10. Metaphase II a. Chromosomes line up along equator individuals 11. Anaphase II a. Centromeres divide b. Daughter chromosomes move to opposite poles 12. Telophase II a. Nuclear envelope reforms b. Spindle disassembles 13. Cytokinesis 14. Overall outcome of meiosis a. 4 haploid daughter cells each containing 1 copy of each chromosome in the unreplicated state...
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This note was uploaded on 02/17/2012 for the course BIO 1130 taught by Professor Simpson during the Fall '11 term at Texas State.

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13 May 2010 Thursday - b. Centromeres do not divide 6....

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