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The Steps of Meiosis (Terms)

The Steps of Meiosis (Terms)

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Tags: science   biology   high school   ngss   hs-ls1-4   ls1-4   meiosis   steps  

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Interphase
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Before meiosis can occur, this step is required for duplication of DNA into sister chromatids connected at centromeres.
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Prophase I
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In this step, homologous chromosomes form tetrads to exchange genetic information (crossover). Other than that, the process is similar to Prophase in Mitosis.
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Metaphase I
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In this step, homologous chromosomes (or tetrads) align along the equatorial plate where they are attached to spindle fibers.
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Anaphase I
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In this step, homologous chromosomes are separated through disjunction and pulled to opposite poles of the cell.
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Telophase I
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In this step, nuclear membranes reform around two new nuclei that contain connected sister chromatids - NOT homologous chromosomes.
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Cytokinesis
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This step occurs after both Telophase I and Telophase II. It is where the original cell finally separates into two new cells.
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Prophase II
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After Meiosis I is completed, this step is where the nuclear membrane breaks down, centrioles migrate to opposite poles, and the spindle fibers form.
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Meiosis II
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In this step, chromosomes align along the equatorial plate and align themselves so that their sister chromatids may be pulled apart by the connected spindle apparatus.
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Anaphase II
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In this step, sister chromatids are separated through disjunction and pulled towards opposite poles of the cell.
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Telophase II
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In this step, nuclear membranes reform around the new nuclei that contain unconnected chromatids - NOT sister chromatids or homologous chromosomes.
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Meiosis I
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Reductional Division: The series of steps in Meiosis that split a diploid cell into two haploid cells by separating homologous chromosomes.
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Meiosis II
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Equational Division: The series of steps in Meiosis that split two haploid cells into four haploid cells by separating sister chromatids.
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Interkinesis
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A period of rest that cells of some species enter during meiosis, between meiosis I and meiosis II.
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