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Published byBridget McDaniel Modified over 9 years ago
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Warm up 12/10 What are the 4 ½ steps of Mitosis in order. –Write one sentence each describing how you can identify the steps.
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Meiosis pp. 161-164
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Double mitosis Results in haploid cells (n) gametes 2n 4n (2) 2n (4) n two stages of meiosis (I and II) CLIP
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Meiosis I 1. Similar to the phases of mitosis 2. 2n 4n (2) 2n 3. separating into homologous chromosomes
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Two important things occur in meiosis I that do not occur in mitosis crossing over and independent assortment
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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 CLIP
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Meiosis is 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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