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In an X-linked inheritance pattern, the mutated gene is on the X chromosome. Duchenne muscular dystrophy, some types of colorblindness and hemophilia A are examples of X-linked recessive disorders.
For a person to have a recessive disorder, it usually requires two copies of the mutated gene. However, males are affected by a single X-linked recessive gene from their mother because they don't have a second X chromosome to override the recessive trait.
A woman who is a carrier of an X-linked recessive disorder has a 25 percent chance of each of the following results with each pregnancy:
If you know — or suspect — that you or your partner has a family history of any genetic disorder, a genetic counselor can help assess your risk of having a child with that disorder. This counselor can also help you decide whether to have genetic testing and explain treatments, preventive measures and reproductive options.
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