I was curious if anyone could answer a question for me about the achondroplasia gene. I heard that it is autosomal dominent, which explains hows two parents with achondroplasia can have a nonachondroplasia child, and also explains hows double dominent disorder occurs. Yet I have read two nonachondroplasia parents can have a child with achondroplasia, and that this is even the majority of cases. If the achondroplasia gene is dominent, how can two indivudals that are both recessive with the nonachondroplasia gene have a child with the dominent gene?
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