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. 1999 Jun 28;145(7):1395–1406. doi: 10.1083/jcb.145.7.1395

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Chiasma counts of oocytes at the diakinesis stage. (a) Diakinesis preparation from an XO oocyte illustrating the difference in morphology between bivalent and univalent chromosomes. The univalent X (arrowhead) can be clearly distinguished from the paired bivalents. The small arrows marking one bivalent show two chiasmata, one interstitial, and one terminal exchange. (b) Diakinesis cell from an MLH1 null female. Two exchange bivalents are present (arrowheads) and the remaining chromosomes are unpaired univalents.