Mutations in the fibroblast growth factor receptor 3 (FGFR 3) gene (above) have been linked to achondroplasia, or dwarfism. Sperm analysis shows that mutations associated with dwarfism gradually increased by about two per cent for every year of age.
Persons with achondroplasia have a 50 percent chance to pass the gene to a child, resulting in the condition. If both parents have achondroplasia, with each pregnancy, there is a 50 percent chance to have a child with achondroplasia, a 25 percent chance that the child will not inherit the gene and be of average height, and a 25 percent chance that the child will inherit one abnormal gene from each parent, which can lead to severe skeletal problems that often result in early death.
Chances of Passing the Disorder
If both the parents are affected by Achondroplasia then their genotype would be Aa. There is a 25% chance that the offspring will have the lethal genotype AA. There is also 50% chance that they will healthy but still have the disorder. 25% of the time the offspring will be normal.
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