Chromosome abnormalities in the human oocyte.
Aneuploidy is the most commonly occurring type of chromosome abnormality and the most significant clinically. It arises mostly due to segregation errors taking place during female meiosis and is also closely associated with advancing maternal age. Two main aneuploidy-causing mechanisms have been described: the first involves the non-disjunction of entire chromosomes and can take place during both meiotic divisions, whereas the second involves the premature division of a chromosome into its 2 ...Expand abstract
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