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Biology presentation

Adam Seruga

on 1 May 2013

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Transcript of Meiosis

Adam Seruga Meiosis Was discovered by German biologist Oscar Hertwig By studying sea urchin eggs Meiosis is a two-part cell division process in organisms that sexually reproduce. It produces gametes (sex cells), which have half the chromosomes of their parent cell. Meiosis has two stages I and II Meiosis I -6 phases
Result: 2 diploid cells (two pairs of chromosomes) Interphase During interphase the cell increases in mass and prepares for cell division Prophase Homologous chromosomes pair up and form a tetrad. The cross- over happens. Metaphase Homologous chromosomes line up along equator to form the metaphase plate. Anaphase Spindle fibers move homologous chromosomes to opposite sides. Telophase and Cytokinesis The cell divides. Meiosis II -5 phases
Result: 4 unidentical haploid cells (half number of chromosomes) Prophase As in prophase I, the chromosomes are condensed. Metaphase The chromosomes line up at the metaphase plate at the cell's center. Anaphase The sister chromatids separate and move toward the opposite cell poles. Telophase and Cytokinesis Nuclear envelopes form at the opposite poles. Crossing-over Chromatids cross over each other. The crossed-over parts exchange alleles (alternative forms of genes). Tetrad 2 Homologous chromosomes- each made of 2 sister chromatids. Importance Meiosis is important for increasing genetic diversity, continuing evolution, and transferring genetic information from generation to generation. Thank you for attention!
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