Peak incidence for Rheumatic fever - Answer✔✔-5 - 15 yrs
hydrocephalus - Answer✔✔-neural tube defect characterized by abnormal accumulation of fluid (CSF) in
the brain
communicating hydrocephalus - Answer✔✔-arachnoid villa are malformed or malfunction
Non-communicating hydrocephalus - Answer✔✔-tiny aqueduct of Sylvius is obstructed within the
ventricles
Trisomy 21 (Down Syndrome) - Answer✔✔-95% have an extra chromosome 21
Mosaicism - Answer✔✔-nondisjunction occurs late in development, both normal and abnormal cells are
present
Translocation of a chromosome - Answer✔✔-a piece of chromosome in pair 21 breaks away and
attaches to another chromosome
cycstic fibrosis - Answer✔✔-a genetic disorder in which the body produces abnormally thick mucus in
the lungs and intestines
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