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Meiosis
Concept 6: Meiosis I: Anaphase I
Concept 6: Meiosis I: Anaphase I
The two chromosomes in each bivalent separate and migrate toward opposite poles.
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• Anaphase I begins when the two chromosomes of each bivalent (tetrad) separate and start moving toward opposite poles of the cell as a result of the action of the spindle.

• Notice that in anaphase I the sister chromatids remain attached at their centromeres and move together toward the poles. A key difference between mitosis and meiosis is that sister chromatids remain joined after metaphase in meiosis I, whereas in mitosis they separate.