Achondroplasia Is a Common Form of Dwarfism Caused by an Autosomal

question 16

Multiple Choice

Achondroplasia is a common form of dwarfism caused by an autosomal dominant mutation in the fibroblast growth factor receptor 3 (FGFR3) gene.Two copies of the mutant gene are invariably fatal before or shortly after birth.If a person with achondroplasia marries a person of normal height,what is the probability that both their first child and second child will have achondroplasia?

• A)1/8
• B)1/4
• C)1/2
• D)1

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