Hemophilia is a disorder in which blood fails to clot. Saad, a male hemophilia, marries sara, a
normal women and together they have four children, two boys (Ahmed and Ali) and two girls
(Alia and Ayesha). None of the children display the symptoms of hemophilia, Ahmed, Ali, Alia
and Ayesha all marry normal individuals and have children. None of Ahmed’s or Ali’s children,
male or female display symptoms of hemophilia, but the sons of Alia and Ayesha display
symptoms of hemophilia while the daughters of Alia and Ayesha do not.
71. Which of the following best explains the reason that Ahmed, Ali, Alia and Ayesha do not
display symptoms of hemophilia, even though their father, saad, is a hemophiliac?
a) Hemophilia is an X-linked disorders, and saad can only pass on his Y chromosome.
b) Hemophilia is an X-linked disorders, and even though Alia and Ayesha received a
hemophiliac X chromosomes from Saad, Sara gave them a normal chromosome
c) Hemophilia is a Y-linked disorder, and therefore cannot he displayed in females
d) Hemophilia is an Y-linked disorders, and Ahmed and Ali must have received an X
chromosome from Saad
e) Hemophilia is an X-linked disorders, even though Ahmed and Ali received a
hemophiliac X chromosome from Saad, Sara gave them a normal X chromosome