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8 Cards in this Set

  • Front
  • Back
Prophase I
•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
Metaphase I
• Spindle fibers attach to the centromeres
• Bivalents line up on the equator
• At the end the chromosomes start to move
Anaphase I
• 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
Telophase I
• Nuclear membrane form around chromosomes at each pole
• Cell divides making two haploid cells
• The chromosomes uncoil partially
Prophase II
• Chromosomes shorten and thicken again
• Centrioles move to the poles in animal cells
• At end, nuclear membranes break down
Metaphase II
• Spindle fibers attach to the centromeres
• Chromosomes line up on the equator
• At end, centromeres divide
Anaphase II
• Two chromatids of each chromosome move to opposite poles
• At end, chromatids reach the poles
Telophase II
• 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