Tanya's son Micah has hemophilia A.Who else in Micah's family definitely has hemophilia A?
A) his mother
B) his father
C) his mother's father
D) his mother's mother
E) his brother

Question

Quizplus · Accepted Answer

Hemophilia A is an X-linked recessive disorder. Males have one X chromosome, so if Micah has hemophilia A, he inherited the affected X chromosome from his mother. His mother's father (Micah's maternal grandfather) must have had hemophilia A to pass the affected X chromosome to Tanya.

Tanya's Son Micah Has Hemophilia A