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8 Cards in this Set
- Front
- Back
prophase
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Chromosomes form and each chromosome pairs with its homologous chromosome; called a tetrad – four chromatids
In a tetrad, homologous chromosomes can exchange portions of their chromatids; called crossing-over Occurs at the chiasma Creates recombinant chromatids (“recombined”) Provides genetic variation – that’s how each one of us is very different from the other Sexual reproduction creates genetic variation |
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Metaphase I
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Tetrads line up in the middle, equatorial plane, of the cell
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Anaphase I
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Homologous chromosomes separate and move away from each other to opposite poles of the cell
Each is genetically different from the original cell due to crossing-over |
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Telophase & Cytokinesis I
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Nuclear envelope forms
Cytokinesis occurs resulting in two daughter cells Daughter cells are NOT identical due to crossing-over in prophase I |
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Prophase II
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Chromosomes form
Nuclear envelope disappears |
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Metaphase II
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Chromosomes line up in the middle of the cell at the equatorial plate
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Anaphase II
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Sister chromatids separate and move away from each other to opposite poles of the cell
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Telophase & Cytokinesis II
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Nuclear envelope forms
Cytokinesis occurs resulting in four genetically different gametes |
