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family which makes bones in a human's skeletonbe too short or grow too slowly. It often affects the femurand humerus. It is caused by a dominant allele. That means only one parent has to have the gene. This gives a child a 50% chance of getting the condition. If both parents have the gene the chances are increased to 75%, but in 25% of the cases, it is very unlikely that the child would live more than a few months. However, the condition can also occur without either parent having the gene. Achondroplasia is caused by a change in the DNAfor fibroblastgrowth factor receptor 3. This change affects the making of cartilage. Now that the part of the DNA that causes the condition is known, there is hope that new treatments may be developed.