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Meiosis pp. 161-164.

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Presentation on theme: "Meiosis pp. 161-164."— Presentation transcript:

1 Meiosis pp

2 Double Mitosis Results in haploid cells (n)  gametes
2n ”4n”  (2) 2n  (4) n Two stages of meiosis Meiosis I Meiosis II CLIP

3 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

4 MEIOSIS I (continued) Two important things occur in meiosis I that do not occur in mitosis crossing over and independent assortment

5 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

6 MEIOSIS II Begins right after meiosis I
1. (2) 2n  (4) n ; 4 haploid cells 2. separating into single chromatids MEIOSIS II CLIP

7 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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