Paediatrics – MCQ 52 – Affected male infant born to normal parents

An affected male infant born to normal parents could be an example of all of the following, except
A. An Autosomal dominant disorder
B. An Autosomal recessive disorder
C. A polygenic disorder
D. A vertically transmitted disorder

Correct answer : A. An Autosomal dominant disorder

An autosomal dominant disorder if present in the parents will always express itself phenotypically. So it is not possible for normal parents to have an child affected with an autosomal dominant disorder.