False,Nondisjunction faults in paternal meiosis I are the main source of instances. About 80% of people who have this syndrome have an additional X chromosome, giving them the karyotype XXY.
Non-disjunction is the failure of chromosomes or chromatids to split during cell division. Daughter cells that are aneuploid have an unusually high number of chromosomes. The most frequent cause is non-disjunction errors in paternal meiosis I.
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