In which condition is the presence of an extra pair of ribs sometimes observed?
ADown syndrome
BTurner syndrome
CHolt-Oram syndrome
DFibrous dysplasia
EKlinefelter syndrome
Which of the following is least commonly associated with Down's syndrome?
APeriodontal disease
BDelayed eruption of deciduous teeth
CPremature loss of deciduous teeth
DRetrognathia
A 10-year-old boy presents with frequent fractures and blue sclerae. This patient most likely carries a mutation in a gene that encodes which of the following proteins?
ACollagen
BFibrillin
CKeratin
DMyosin
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