Increased recurrence risk with parental translocation [MISCELLANEOUS] Mosaic trisomy 21, 2.4% [MOLECULAR BASIS] Translocation 21, 3.3% [MOLECULAR BASIS] Incidence, 1 in 650-1000 live births [MISCELLANEOUS] Meiotic origin >95% maternal, mostly meiosis I [MISCELLANEOUS] Full trisomy 21, 94% [MOLECULAR BASIS]
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