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Meiosis http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html.

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Presentation on theme: "Meiosis http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html."— Presentation transcript:

1 Meiosis

2 Interphase Same as in mitosis Growth and Replication G1 – cell growth
S – replication of chromosoms G2 – growth and preparation for cell division

3 Chromosomes

4 Karotype

5 Prophase I Chromosomes thicken and condense ( become visible)
Centrioles move to the poles Nuclear envelop disappears Homologous chromosomes come together during SYNAPSIS to form a TETRAD Crossing-over occurs

6 Metaphase I Chromosomes move to the equator as a tetrad
Spindle fibers attach to chromosome

7 Anaphase I Spindle fibers shorten
Homologous chromosomes separate and move to the poles

8 Telophase I / Cytokinesis
Cell membrane begins to pinch in Nuclear membrane reappears The cytoplasm divides Formation of cell membrane Results in two haploid daughter cells

9

10 Meiosis II Proceeds just as mitosis with the exception of chromosome replication. THEY DO NOT REPLICATE AGAIN!!! Prophase II Metaphase II Anaphase II Telophase II Cytokinesis

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13 ??????????????????????


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