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8 Cards in this Set
- Front
- Back
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Prophase I
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•Chromosomes shorten and thicken
•Homologous chromosomes pair up •Crossing over may occur •Centrioles move to the poles in animals •At end the nuclear membrane breaks |
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Metaphase I
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• Spindle fibers attach to the centromeres
• Bivalents line up on the equator • At the end the chromosomes start to move |
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Anaphase I
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• The two chromosomes of each bivalent are pulled apart and move to opposite poles
• This cuts the chromosome number in half. Each chromosome consists of two chromatids • At end, chromosomes reach the poles |
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Telophase I
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• Nuclear membrane form around chromosomes at each pole
• Cell divides making two haploid cells • The chromosomes uncoil partially |
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Prophase II
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• Chromosomes shorten and thicken again
• Centrioles move to the poles in animal cells • At end, nuclear membranes break down |
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Metaphase II
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• Spindle fibers attach to the centromeres
• Chromosomes line up on the equator • At end, centromeres divide |
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Anaphase II
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• Two chromatids of each chromosome move to opposite poles
• At end, chromatids reach the poles |
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Telophase II
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• Nuclear membranes form around chromatids at poles. Each chromatid is now considered to be a chromosome
• Two cells each divide to form two cells (four cells in total) • Chromosomes uncoil, nuclei reappear • At end, develop into gametes |
