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Nowadays, oocyte donation is an extended practise in IVF programmes. However, to date, little information on aneuploidy frequency in oocytes from donors is available. Aneuploidy is one of the major causes of embryo and fetal wastage as well as of congenital mental and developmental disabilities. It is known that most aneuploidies are due to non-disjunction events occurring in the maternal germ line. Linkage studies have associated abnormal patterns of meiotic recombination to the origin of the non-disjunction event in many aneuploid conditions.

Cytogenetic analyses of human oocytes provide new data on non-disjunction mechanisms and the origin of trisomy 16