Which human genetic disorder is an X-linked recessive condition characterized by an impaired ability of blood to coagulate normally?
Answer and explanation
Correct answer: C. Hemophilia A
- Step 1: Hemophilia A is caused by an inherited deficiency of blood clotting factor VIII encoded on the X chromosome. Step 2. Because males carry only one X chromosome (XY), a single mutant allele results in clinical hemophilia. Answer: Hemophilia A. Why not the others: Sickle cell anemia and cystic fibrosis are autosomal recessive; Huntington disease is autosomal dominant.
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