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Transcript of Meiosis
Sister Chromatids Meiosis: The process of cell division that results in the formation of 4 sex cells (gametes). Meiosis is essentially mitosis twice. The total number of chromosomes at the end of meiosis is half the number in somatic cells. After crossing over the first of two divisions occurs.
During the first division (Meiosis I) the homologous chromosomes separate and each phase is numbered with a 1 after it. Before any division occurs the homologous chromosomes (one from mom, one from dad) perform an action called crossing over. During crossing over homologous chromosomes exchange genes with each other. This gives greater genetic diversity which is important to the health of all organisms. Watch as your teacher demonstrates crossing over on the board and sketch a picture of this in the space provided. Watch as your teacher demonstrates Meiosis I on the board and sketch a picture of this in the space provided. After Meiosis I occurs, Meiosis II occurs. During Meiosis II sister chromatids separate and 4 cells are created. Each phase is now numbered with a II after it. Watch as your teacher demonstrates Meiosis II on the board and sketch this in the space provided. Will gametes always have the same chromosomes after meiosis? Lets find out!
Follow along with your teacher as she separates chromosomes through Meiosis I and II again. The result of meiosis is 4 genetically different cells with a haploid number of chromosomes (half). Why is it important that these cells have a haploid number of chromosomes? Check for Understanding Answer So that when two gametes combine there is a normal diploid number. Lets review some of the vocabulary we discussed today. Somatic Cell Gamete Diploid Haploid Homologous
Chromosome Sister Chromatid Crossing Over Exit Ticket Using your key vocabulary fill in the table comparing mitosis and meiosis. Summary: Take three minutes to write a 2-3 sentence summary of what you learned in class today. During this video write down one thing that you learn that you didn't know before.