Hemophilia A is caused by
A) an X-linked recessive disorder.
B) a Y-linked recessive disorder.
C) a defective neuron response.
D) an X-linked dominant disorder.
E) a Y-linked dominant disorder.

Question

Quizplus · Accepted Answer

Hemophilia A is sex-linked. Since males have only one X chromosome, every male with the recessive allele will have the disorder. Therefore, the disorder shows up much more in human males than in females.

Hemophilia a Is Caused by