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H/G- Meiosis Notes 1. What is the purpose of meiosis? Meiosis is the process by which ___________________ are produced. These sex cells are _____________________ 2. Number of chromosomes in meiosis versus somatic (body) cells Human body cells have _____chromosomes Human sex cells, sperm and eggs, have _______ chromosomes 3- Why should gametes have only half the number of normal chromosomes??? During meiosis, _________________ daughter cells are produced from ____________ parent cell. During meiosis the cell actually divides ____________ Meiosis I and Meiosis II 4- MEIOSIS 1 Prophase I: a. Homologous chromosome pairs move together, to form a ____________. This pairing is called ___________________ b________________ disappears c. Crossing-over may occur at the _______________ ______________________ allows for the ______________________________ between neighboring homologous Metaphase I: a. Tetrads line up at the ___________________ b. Homologous Chromosomes line up ______________________ Anaphase I: a. __________________ chromosome of each pair gets pulled to opposite poles. b. The sister chromatids do not separate. It is still ____________ Telophase I and Cytokinesis: a. Cells separate; two new cells are formed that are _______________ b. Nuclear membrane ______________ Interphase occurs between meiosis I and meiosis II to prepare the cell for division again NO DNA REPLICATION HAPPENS!! 5- Meiosis 2 Prophase II a. Chromosomes ___________________________ b. Spindle fibers appear Metaphase II a. The chromosomes align along _____________ of the equator. Anaphase II a.the fibers pull the chromatids ______________ and toward ______________ of the cells. Called _______________ Telophase II The chromatids arrive at the either end of each cell and new _______________ form. Cytokinesis The rest of the cell continues to divide. Only when two, distinct cells form will cytokinesis, the division of the cell's cytoplasm, be complete Final Results of Meiosis ___________________ which will develop into ____________________ Each daughter cell has ______________________________ of a somatic cell _________chromosomes for each sex cell NOTE: Males will create _______________________ for every one cell that goes through meiosis Females will create _________________________ will turn into unusable polar bodies and _________ will mature into an egg cell. Label the phases of meiosis 1, and draw what the resulting daughter cells would look like before going into meiosis II. Label the phases of meiosis 2, and draw what the resulting daughter cells would look like before going into meiosis II. How are the daughter cells in meiosis 2 different from meiosis 1?