Most common chromosomal abnormality
Trisomy
Mcc of primary amenorrhea
Turner syndrome
Most common form of MR in males
Fragile x syndrome
Specific primary abnormality of development
Malformation
Defect in organs already normally developed
Deformity
Major destruction of a structure already formed
Disruption
What protein implicated in alzheimers is encoded in chr 21 as seen in down syndrome
Amyloid beta protein