Crossing over, or reciprocal recombination, is essential for accurate segregation of homologous chromosomes at the first meiotic division, resulting in gametes containing the correct chromosome number. A new study in human oocytes analyzes the genome-wide recombination and segregation patterns in all the products of female meiosis, providing experimental support for existing theories about the origin of human aneuploidies and highlighting a novel reverse segregation mechanism of chromosome segregation during meiosis.
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Brieño-Enríquez, M., Cohen, P. Double trouble in human aneuploidy. Nat Genet 47, 696–698 (2015). https://doi.org/10.1038/ng.3344
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DOI: https://doi.org/10.1038/ng.3344
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