Narrative: Achondroplasia, a Hereditary Form of Dwarfism, Is an Autosomal Dominant

question 42

Multiple Choice

Narrative:
Achondroplasia, a hereditary form of dwarfism, is an autosomal dominant disorder; however homozygous dominant individuals either die before birth or very shortly thereafter. The homozygous recessive condition is normal. A dwarf couple decide to have children. Use this information to answer the following question:
Of the children of this couple who survive, what is probability that they will be affected by achondroplasia?

• A) 0
• B) ¼
• C) 1/3
• D) 2/3
• E) ½

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