A genetic disease that is caused by a deletion in the X chromosome is

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Duchenne muscular dystrophy is caused by a deletion in the X chromosome, specifically in the dystrophin gene. Sickle-cell disease is caused by a point mutation in the beta-globin gene, hemophilia is caused by mutations in genes that encode factors involved in blood clotting, and PKU is caused by mutations in the phenylalanine hydroxylase gene. Therefore, choices A, B, D, and E are incorrect.

A Genetic Disease That Is Caused by a Deletion in the X