chromosome mutation

What Chromosome Is Achondroplasia On? Although this condition can be inherited in an autosomal dominant manner, 80% of cases are due to new, sporadic mutations. Mutations involve the gene encoding fibroblast growth factor receptor 3 (FGFR3), situated on chromosome 4. What gene or chromosome is affected by achondroplasia dwarfism? Mutations in the FGFR3 gene cause