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Meiosis pp
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Double Mitosis Results in haploid cells (n) gametes
2n ”4n” (2) 2n (4) n Two stages of meiosis Meiosis I Meiosis II CLIP
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1. Similar to the phases of mitosis 2. 2n “4n” (2) 2n 3
1. Similar to the phases of mitosis 2. 2n “4n” (2) 2n 3. separating homologous chromosomes MEIOSIS I
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MEIOSIS I (continued) Two important things occur in meiosis I that do not occur in mitosis crossing over and independent assortment
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MEIOSIS I (continued) Synapsis: during prophase I chromosomes line up with homologues via corresponding genes to make a tetrad Crossing-over: random exchange of genetic material during synapsis homologous pairs overlap and twist on each other (not always the exact same spot!!) Independent assortment: random separation of the homologous chromosomes occur during anaphase I
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MEIOSIS II Begins right after meiosis I
1. (2) 2n (4) n ; 4 haploid cells 2. separating into single chromatids MEIOSIS II CLIP
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Meiosis = the formation of Gametes
Spermatogenesis (testes): males produce sperm cells Oogenesis (ovaries): females make eggs and produce one egg and 3 polar bodies (useless) at the end of one cycle of meiosis- occurs only at ovulation
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