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Biology project

lauren usman

on 4 January 2013

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Transcript of miosis

Worksited Meiosis is the cell reproduction of haploid cell. It is important in ensuring the genetic diversity in sexual reproduction. unlike mitosis, meiosis produces four new daughter cells with half the number of chromosomes that are in the parent cell. Before the start of meiosis the chromosomes in the original cell are copied.During meiosis the cell nucleus is divided twice, so the stages of meiosis are categorized into two parts; Meiosis 1 and Meiosis 11. Introduction to Meiosis In Meiosis I, homologous chromosomes are separated, producing two new cells. the steps of Meiosis I are; Prophase I, Metaphase I, Anaphase I, and Telophase I.
In Meiosis II the sister chromatids in both homologue are separated. The steps in Meiosis II are; Prophase II, Metaphase II, Anaphase II, and Telophase II. Meiosis I and Meiosis II Meiosis I Meiosis begins with a diploid cell which has all it chromosomes copied... Meiosis II Meiosis II begins after telophase I, when the two new cell have been separated. The chromosomes are not copied a second time before Meiosis II. Halimat Usman-Isiaka, Jordyn Howard, Stephen Claiborne Miosis Prophase I During prophase I the chromosomes condense, and the nuclear envelope breaks down. The Dyad pairs connect to make tetrads, and the chromatids exchange genetic material in a process called crossing over. Metaphase I During metaphase I, spindle fibers- which consist of microtubules- attach to each dyad. The tension from the spindles align the tetrads at the center of cell. Anaphase I During Anaphase, the chromosome are move to the opposite poles of the cell. The spindle fibers pull the chromosomes apart form each other. Though the chromosomes are separated the chromatids are not separated by their centromeres. Telophase I During Telophase I, the chromosomes gather at the poles, and the cytoplasm divides. The two new cell are haploid and are ready to begin Meiosis II Prophase II Prophase II starts right after Telophase II, skiping interphase. During prophase II the nuclear envelope dissolves, and the spindle fibers start to form again Metaphase II The chromosomes are lined up along the equator of the cells, and the spindle fibers are attached to the centromeres. Anaphase II The chromatids are divided at the centromere, and moved to the opposite poles of the cells Telophase II A nuclear envelope is formed around each set of chromosomes. The spindle breaks down, and the cell goes through cytokinesis DeSalle, Rob, and Michael R. Heithaus. "meiosis and sexual reproduction." Holt biology. Austin, Tex.: Holt, Rhinehart and Winston, 2008. 250-254. Print.
"Meiosis: An Interactive Animation." Home of CELLS alive!. N.p., n.d. Web. 4 Jan. 2013. <http://www.cellsalive.com/meiosis.htm>.
"Prophase 2." ThinkQuest : Library. N.p., n.d. Web. 4 Jan. 2013. <http://library.thinkquest.org/C004535/text
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