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% of nondisjunctions maternal in origin
90%
% of nondisjunctions in meiosis 1
75%
most common recognized trisomy
trisomy 16
does meiosis 1 or 2 usually account for trisomy 16?
meiosis 1
does meiosis 1 or 2 usually account for trisomy 18?
meosis 2
If meiosis 1 causes UPD this is....
uniparental heterodisomy
If meiosis 2 causes UPD this is....
uniparental isodisomy
x of y cards