Females reproduce by making eggs in their ovaries. The process of making an egg involves an oocyte precursor completing two rounds of chromosome segregation, a process called meiosis

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Article in Current Biology.
Science daily comment.

The figure shows erroneous chromosome segregation in the oocyte in which genes coding Aurora B and C were functionally disrupted. The oocyte was imaged using confocal microscope and selected time points of meiotic maturation are shown.