During anaphase I, the two chromosomes in each bivalent separate and migrate toward opposite poles.

Anaphase I
Anaphase I, Macroevolution.net, Illustration and text; links to other topics.
Anaphase i
Anaphase i BiologyOnline.org A definition of anaphase I.
Meiosis I: Anaphase I
Meiosis I: Anaphase I, Prentice Hall BioCoach Activity, Description and animation.