All of the following are true about Down syndrome except for one.
AIncidence of Robertsonian translocation is 1:1000
BMost common cause is trisomy 21
CMosaicism 21 has no association with maternal age
DExtra chromosome is of maternal origin
EIncidence increases with advanced maternal age
Gene not involved in SCID:
ABTK
BZAP70
CIL2RG
DJAK3
Prader-Willi syndrome and Angelman syndrome are examples of what genetic phenomenon?
AGene Knockout
BImpaired DNA repair
CGenomic Imprinting
DRNA interference
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