Assume that in a family, the mother is a carrier of hemophilia and the father is normal. One of their sons suffers from hemophilia, while the other is completely normal. One of their daughters is also a carrier, and the other is normal. In this case, the allele associated with hemophilia is _________.

• A. X-linked recessive
• B. X-linked dominant
• C. autosomal recessive
• D. autosomal dominant

Answer: (A)