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. 2009 Jan 23;5(1):e1000348. doi: 10.1371/journal.pgen.1000348

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Hughes et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Diagram shows the presumed movement and co-orientation of a pair of chiasmate chromosomes and a pair of achiasmate chromosomes starting at the end of prophase I until metaphase I arrest as based on previous studies of fixed images of Drosophila oocytes. Chiasmate chromosomes (red) are locked at the spindle midzone with proper co-orientation due to chiasmata (green) holding them together. Prior to GVBD achiasmate chromosomes (black) are paired and co-oriented using heterochromatic pairings. The co-oriented achiasmate chromosomes move directly towards opposite spindle poles during mid-prometaphase while chiasmate chromosomes are locked at the spindle midzone. During the poorly defined stage of late prometaphase achiasmate chromosomes congress to the spindle midzone. During metaphase I arrest the retracted chromosomes form a ‘lemon-shaped’ structure.