Some of the possible genotypes for the parents of a child with dwarfism is a RR mother, and a RR father, then 100 percent of their children will have dwarfism. If a both of the parents are Rr then 75 percent of their children will have dwarfism. If one parent is RR and the other parent if Rr then all of their children will have dwarfism. Also if the mom is Rr and then dad is rr then at least 50 percent of of their children will have dwarfism. The abnormality of dwarfism is a faulty allele, a mutation in the growth factor in gene 3. The mutation is also called FGFR3.
