Achondroplasia Is a Common Form of Dwarfism Caused by an Autosomal

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